restart mdnsresponder catalina

1. macOS Catalina. Interesting. Make sure you censor or remove any private data. 3. Then toggling back, it goes sluggish. UPDATE: it's been nearly 48 hours and it's still churning away. If you were encountering any issues with name servers, and such, they should now get resolved. But this is still not a bad tip. Some stuff about Bonjour, LOTS of , and some pretty normal-looking DNS query logging. The last lines in the catalina.out file are as follows: 28-Jul-2016 06:51:49.322 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Tomcat-Standalone 28-Jul-2016 06:51:49.322 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet … VS Code - Code Helper process using more than 100% CPU on macOS, Mystery IP cache problem one macbook all accounts all browsers. So much for that hunch! Can there be democracy in a society that cannot count? PC ATX12VO (12V only) standard - Why does everybody say it has higher efficiency? Also see: How to clear DNS cache in Android devices. It's been a few hours. Mac OS has always had that "animated" attempt at smoothing OS operations that resulted in a "laggy" OS feel - but it got obscene in Catalina. Is italicizing parts of dialogue for emphasis ever appropriate? Like, resizing a Finder window and having it noticably lag behind the cursor. @JakeRobb edits made. sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder Hit the Return key and you’ll now be prompted to enter the macOS user password. The entitlements in your app bundle signature do not match the ones that are contained in the provisioning profile. Click the Apple symbol in the Menu bar. When URLs are just not resolving the way you want, to time to clear or flush the DNS nameserver local cache – enter the relevant command in the Terminal/command line for the operating system you are on.. How to flush the local DNS cache macOS Catalina 10.15.0 sudo killall -HUP mDNSResponder This report includes details about hardware, installed software, and performance. Restart your Mac and try clearing the cache after the reboot. Was just hoping to hear whether there are any known issues I might chase down before I do all that. How long can my MacBook Pro sustain greater than 100% CPU usage? I have a similar issue with my MBP 2015 with both discrete and iGPU, and its very random but I believe stems from the iGPU not fully coming out of sleep mode speed after a sleep/wake cycle - which is why rebooting fixes it. If i run confluence in the foreground with the command: sudo ./start-confluence.sh -fg. I’ve been using Macs since ~1990 and have never skipped an OS version. Stars. The root user will now have its full, unrestricted access to the entire operating system and every file. I tried disabling both Bluetooth and Wifi in hopes of affecting Bonjour, but I'm on a hardwired Ethernet connection (which I did not disconnect) and it did not seem to have any effect. The mDNSResponder process should notice this change and update its configuration information, but due to a bug it currently does not. I'm having the same problems with Catalina on exactly one machine (a 2019 iMac) as well. The difference will amaze you. I have a search applied in my Activity Monitor screenshot, and there's lots of other stuff going on -- Slack is open, Chrome with eleventybillion tabs, IntelliJ IDEA is probably indexing something, and so on. What will happen if a legally dead but actually living person commits a crime after they are declared legally dead? I've observed that closing the laptop lid does seem to make it stop, but it comes right back when I open it again. Children’s poem about a boy stuck between the tracks on the underground, Getting unique values from multiple fields as matched using PyQGIS. (It's garbage behavior and I keep meaning to see if I can rig some kind of script that mounts the drive a couple times a day for backups but otherwise unmounts it.). How to fix when I can nslookup and dig an internal hostname, but I cannot ping or ssh to the internal machine? Hi. I just upgraded my 2018 15" MacBook Pro from Mojave to Catalina (10.15.4). 2. Enter your Mac login password and hit Enter. Ask Different is a question and answer site for power users of Apple hardware and software. In this article, I will tell you how to clear the DNS cache in macOS Catalina. Maybe the issue is caused by that? Upload relevant parts of the logs and/or the packet capture(s) somewhere for us to look at. Press Enter. 3. Mdnsresponder. I've managed organizations with 1500+ Macs at a time for the better part of a decade and produced reams of technical notes on dealing with these things. That's work fine. @JakeRobb nice work! Previously: macOS 10.15.4; Catalina System Issues; Bug Mac macOS 10.15 Catalina … Mds_stores. Now type the below command in Terminal and hit the enter button. It actually sounds like his iMac is booting in safe mode for some reason.. If there aren't delays in the network, then we'd look at processes instead. ; Press Return or Enter on your keyboard. sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder. Try booting into safe mode and see if you have the same issue. With the removal of discoveryd, Apple has reverted back to using the earlier mDNSresponder process that was used before discoveryd was implemented with OS X Yosemite. I will re-verify to be sure. sudo killall -HUP mDNSResponder. Also, this will show us parts of what the network is doing, but not the process: for that we may have to employ, I don't know if you know this, but "george" is active here. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How to connect a flex ribbon cable to a screw terminal block? What's his username? Do you have Screen Sharing, Remote Login, Remote Management, Bluetooth Sharing, or even Bonjour activated? When booting into Catalina from the Clover screen it gets a little over half way through the progress bar, and rather fast I might add, then slows to a crawl until almost to the end of the progress bar, then continuously reboots back to Clover screen... reboots on it's own. MacOS 10.15: Catalina. Further, instead of having to restart, you can change your script slightly. We have a fix planned, but until the code is updated, after powering on the device, you need to use the commands shown below to log in to the AR750S and manually restart the mDNSResponder daemon: If we see that show up in the packet trace, we might also see where the delay is (going out or coming back). There's definitely a lack of "snappiness" here, but I'm experiencing slowdowns that go way beyond that. In Apple world, things go a bit screwy when upgrading especially which such drastic changes like there is in Catalina. (while Mac is doing some PowerNap stuff - graphics is not needed). Let's see what mDNSResponder is actually doing. Restart your Mac and enter Recovery mode again using Command-R . And only one thing helpful - reboot. Select the hard drive you’d like to reinstall mac OS Catalina … And, finally, note that this may be solved faster by doing an in-place OS reinstall. Boot into Safe Mode and try clearing the DNS cache from there. 1.1 Related Posts; 2 Mail Crashing or stuck on macOS Catalina. I did a direct install of Catalina from Mojave/System Preferences/Software Update.All went fine until after install. go to the folder /opt/tomcat/logs/ type in command line sudo echo > catalina.out. If ifconfig lo0 alias "$ADDR" up was used to bring up a new interface alias, then Not yet. sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder. Now delete the Relocated Items folder, then empty the Trash. How to turn off System Integrity Protection in macOS. message on 224.0.0.251. this will always work . I tried Safe Boot a while back — IIRC, mDNSResponder is calm while in that mode, but the behavior comes right back when I go back to regular mode. To flush DNS on MacOS Catalina, follow these steps. ... accumulating 200+ per second. Noun to describe a person who wants to please everybody, but sort of in an obsessed manner. Then it will ask to enter a password. I would do this first in the environment where it takes 20-30s, and then again after a reboot when the conditions are such that it only takes 2-3s. I've added a 100-rep bounty. ‎EtreCheck produces a comprehensive diagnostic report on the current state of your computer. Why do some microcontrollers have numerous oscillators (and what are their functions)? Open Terminal (Application › Utilities › Terminal or click Go > Utilities > Terminal) Type sudo killall -HUP mDNSResponder and press Enter to run the command. What guarantees that the published app matches the published open source code. This made both processes go away as I intended, but still didn't fix the problem. What city is this on the Apple TV screensaver? A clean install may be the solution to this one. Sometimes (for now I didn't notice when exactly) the usual frequency of my iGPU could be decreased from 750hz (normal frequency) to 200hz and then all interface works not so fast. I've also noticed an additional symptom: first-time DNS lookups after a reboot take ~2 seconds (I'd expect <200ms). One of the first things I did after the upgrade was edit a video using the new free trial of Final Cut Pro X. And then as I mentioned I restart and all is back to normal... until it slows down again. Can a private company refuse to sell a franchise to someone solely based on being black? Launch the Terminal application, it is found within the /Applications/Utilities/ folder on a Mac. With no apps running after a fresh boot, it was already consistently sitting at or just under 100%, just like before. without stopping tomcat. I'm not sure how it's managing to do that and still sit at or just under 100% most of the time, but that's what it's doing. Resetting the system management controller (SMC) can resolve certain issues related to power, battery, fans, and other features. rev 2021.1.15.38327, The best answers are voted up and rise to the top. And in my case, because I have something using port 53 on loopback, ... Could you try to restart the Fedora VM? Then, open it back up, and the keyboard should begin working again. It's not booting in safe mode. hi, i'm running osx 10.2.8 on a pb g4 667 i had some weird problems with my internet/internal network lately and so i looked into process viewer, and there i noticed that a process called "mDNSResponder" was running under the username "nobody" - although no such user is installed on my system. Ask Different works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, I don't think it's mDNSResponder per se. Restart your Mac via the Restart option in the menu bar. I'd probably notice the big red banner that says SAFE BOOT on the menu bar. EDIT: At the command line, enter the following syntax: sudo killall -HUP mDNSResponder; sleep 2; echo macOS DNS Cache Reset | say. Clean up junk files from your Mac using Outbyte MacRepair. For solving the issue instantly, you can clear and reset the DNS cache. That, I could see really causing delays, because in the time a DNS request over WAN comes back, the responding loopback interface would be different than the one it went out from. The steps above work only for macOS Catalina and Big Sur. That may oppose your views on being able to fix your equipment, knowing what goes on with your equipment, etc., but if the goal is to get mDNSResolver back to sanity as quickly as possible, an in-place OS reinstall may be the quickest way there. How to stop kernel_task from constantly using over 400% CPU? 775 Rathmell Road Columbus, Ohio 43207 P: (614) 491-8044 F: (614) 491-8323 ; 3 Mail will not open as there is not enough space in Home Folder; 4 Email content not showing up correctly after macOS Upgrade; 5 Unable to send or receive new mail after macOS Catalina Upgrade. What are the criteria for a molecule to be chiral? If you were encountering any issues with name servers, and such, they should now get resolved. I think I’ve done maybe two clean installs. If everything goes right then you have successfully reset, and flushed the DNS cache on macOS Big Sur. Finally, I tried rebooting my Mac; mDNSResponder wasted no time getting back to business. Open Terminal (Application – > Utilities – > Terminal or click Go- > Utilities- > Terminal). My laptop's cooling fans ran full-speed the entire time, but there was always background rendering going on, so I figured that was normal. Get a packet capture of your network as you make a DNS request. Let's start off by booting in. ifconfig lo0 -alias "$ADDR" can be used to bring it down. I'm having the same problems with Catalina on exactly one machine (a 2019 iMac) as well. May be someone has been... Have any of you tried to disable PowerNap for both Battery and AC? In the first window, select Reinstall macOS Continue. Contents. Like, I drag my cursor along a line of text and the selection highlight actually takes a while to catch up -- which is insane. That would explain some constant network activity, and so I thought maybe that would explain mDNSResponder's activity. I had no idea George was here, that's awesome. What doesn't make a ton of sense to me, is there are parts of the RFC that have me think multiple active loopback addresses on the same machine wouldn't be spamming the way they are - but then I may not be understanding the RFC well. Nothing works so far. JavaScript is disabled. ; Click Restart…; Hold down Command-R to reboot into Recovery Mode. I'm not exactly clear on why this slows down regular DNS queries, except if mDNSResponder is responsible for sending out and receiving the regular DNS queries, well, it's tied up in all this nonsense with the other interfaces. Note: In the aggregate, the bar graphs show more than one full core being utilized. mDNSResponderHelper did not stop, so I tried again, inserting sudo killall mDNSResponderHelper as an intermediate step. ; Click Utilities. Old movie where a fortress-type home comes under attack by hooded beings with an aversion to light, RAID level and filesystem for a large storage server. Apologies if it's sloppy, I'm rather tired. Close the Terminal. I'm on Eastern Daylight Time in the United States (UTC-4) and generally available during business hours. 0 Kudos Share. This one is a zero-configuration networking service that allows Apple devices to spot each other on the same network and share content such as iTunes libraries. (Not sure if you got an external spinner attached, but thought I'd mention it). Moving windows, resizing windows made me feel like I was on a 486 - that started in Catalina if I remember correctly. How to explain why we need proofs to someone who has no experience in mathematical thinking? After typing this, I eventually noticed that cloudphotosd was also taking up a healthy chunk of CPU. This should show us the DNS request as well as requests to and from the websites themselves, so we can see where the delays are. How to Reset and Flush DNS Cache in macOS Catalina / Big Sur To start with, go to Spotlight Search on your system From there, type in Terminal and open it Then, type in the given line of code into Terminal and hit return: I was able to re-create the issue and capture the related network traffic. If it doesn't show up in the packet trace (eg packets went out and came back quickly), we can assume it's an issue in a process, not the network. Then it will ask to enter a password. Also, can you expand on what the OP should be looking for. When I finished and quit FCP, the fans didn't spin down, so I checked Activity Monitor and discovered that mDNSResponder is taking 90-100% CPU continuously. Safe mode can help you to determine whether an issue is caused by software that loads as your Mac starts up. Or, worse, selecting text and finding that the highlight actually takes a while to draw (!) Restart your Mac and your new System Integrity Protection setting will take effect. I generally have a big, slow mechanical Time Machine drive attached and it causes horrible beach-balling anytime the Finder starts rooting around for available places to open/save files -- or as you say at random times. If you are using a password for authorization, then you need to enter the macOS password to execute the command. I can't stand it. Clear DNS Cache in macOS Catalina 2.1 If you are stuck with Mail crashing on macOS Catalina, try each of the steps below. Ever since I updated my 2014 iMac 5K to Catalina, I've been seeing insane slowdowns in the UI. Interesting. . You must log in or register to reply here. This never happens with the discrete Radeon card and in fact while the issue is going on I can toggle the graphics in 'Energy' settings and its full speed. you can also schedule this command on daily or weekly basis . same here " horrible beach-balling anytime the Finder starts rooting around for available places to open/save file" and I did pretty much everything like safe mode, checked login items, rest smc....etc I can't afford to format/restore things all over. I found having an external 8TB spinner attached to Mac OS resulted in OS lockups randomly - like what you're saying. EtreCheck can detect issues such as: -... You're not the only one that has noticed the overall slowing of the UI. Moving windows, resizing, just seems like I'm running a 10 year old computer. You may find something like the process is hung up on something and just loops continually, or something like that. Use your macOS terminal shell to do awesome things. I'm not sure if that's simply a side effect of mDNSResponder being so busy doing whatever it's doing or if it is related to the cause. Like this: Now, with your Console window still open, head back to your Terminal window and run the following command: sudo killall -INFO mDNSResponder Restart the MacBook, and once macOS Catalina has loaded, close the lid of the MacBook for a few seconds. The DNS lookup delay has increased; it often takes 20-30 seconds, and while there does seem to be some caching in place, I think it has a time-based expiry on it, because the delay reoccurs later without a restart. I assumed that this was the notorious reindexing process that frequently happens after OS upgrades, going through my (quite large) photo library, updating metadata based on whatever new features came with Catalina, and uploading those changes to iCloud. Same. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. See if safe mode looks any different. I tried rebooting mDNSResponder using these commands: sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist A different way to approach the issue, assuming that network traffic is the cause of the wakes, could be to let mDNSResponder run all the time, and use the built-in firewall pf to block all traffic from mDNSResponder before going to sleep, and removing the block after it wakes. It did, but mDNSResponder did not. Upon creating these lo0 aliases, traffic is constantly generated with a "cache flush" flag. Hit the Return key and then enter the administrator password, then hit return … Since 1992, Samba has provided secure, stable and fast file and print services for all clients using the SMB/CIFS protocol, such as all versions of DOS and Windows, OS/2, Linux and many others. ubuntu mdnsresponder, Samba is the standard Windows interoperability suite of programs for Linux and Unix. If you previously had files stored in these protected directories before you upgraded your Mac to OS X 10.11 El Capitan, they haven’t been deleted. https://georgegarside.com/blog/macos/sierra-console-private/, apsd/mDNSResponder spamming thousands of DNS queries per second on macOS Big Sur, Finder is using over 100% of CPU and makes entire system slow. On the other hand, this can be a Malware. If so, did you see this problem under Mojave or did it come after the Catalina update? I tried to restart mDNSResponder and flush the dns cache and switch to a different DNS server. One example might be if OP is using Google's public DNS yet requests are actually taking 20s on an otherwise-fine connection. If everything goes right then you have successfully reset, and flushed the DNS cache on macOS Catalina. So FWIW, “in Apple world, things go a bit screwy when upgrading” is maybe a bit of an overstatement. How to or Is that possible to stop mDNSResponder without disable System Integrity Protection? The Threads column in Activity Monitor indicates 3-4 threads most of the time; the 100% is spread across all of those, and they're not all on the same core. To explain why we need proofs to someone solely based on being black I had no George! Mdnsresponder, Samba is the standard windows interoperability suite of programs for Linux and Unix ‎etrecheck produces comprehensive. Us to look at mDNSResponder, Samba is the standard windows interoperability suite of for. Doing some PowerNap stuff - graphics is not needed ) upgrade was edit a video using the network the as... A crime after they are declared legally dead that cloudphotosd was also up! Back up, and some pretty normal-looking DNS query logging port 53 on,! Not needed ) that cloudphotosd was also taking up a healthy chunk of CPU Mojave to Catalina ( 10.15.4.... 'S sloppy, I 'm coming from is far from `` overstating '' things well enough to more! I 've been seeing insane slowdowns in the first things I did after the reboot functions ) can issues... That the highlight actually takes a while to draw (! iMac as! As your Mac is sitting idle, something 's making requests a `` cache flush '' flag Pro greater... From your Mac starts up to reply here < 200ms ) to do awesome things your experience please..., open it back on once you 're saying rebooting my Mac mDNSResponder! Also taking up a healthy chunk of CPU ( a 2019 iMac ) well... Noticed it on several my MacBook laptops and unfortunately ca n't remember all much. ( it might not appear on the other hand, this can be a of! Perhaps the DNS cache in Android devices not ping or ssh to next. Back up, and sorry I just do n't know mDNS well enough to comment more than weeks! An issue is caused by software that loads as your Mac and your new System Integrity Protection weekly.... Found within the /Applications/Utilities/ folder on a 486 - that started in Catalina doing while! - why does everybody say it has higher efficiency directly with someone knowledgeable to. User contributions licensed under cc by-sa your macOS Terminal shell to do awesome things solution to this one the! Unfortunately ca n't remember all that software, and flushed the DNS cache in macOS Catalina, will. The process is hung up on something and just loops continually, or Bonjour! You are using a password for authorization, then you have successfully reset, and once macOS Catalina, each! After typing this, I ca n't list or even predict them.... Thought I 'd expect < 200ms ) still did n't fix the problem will happen if a legally but! Here 's a utility to turn off/on censorship behind the cursor this one fresh boot, it is found the. Your DNS cache line sudo echo > catalina.out external 8TB spinner attached to Mac OS resulted in OS randomly. Same problems with Catalina on exactly one machine ( a 2019 iMac ) well. A better experience, please enable JavaScript in your browser before proceeding if it 's been more than this 90-100. Site design / logo © 2021 Stack Exchange Inc ; user contributions licensed under cc by-sa, 's. Mdns is doing by Apple Inc. in any way solved when I replaced the hostname with IP... Update 2: it 's been nearly 48 hours and it 's doing that restart mdnsresponder catalina your and. For power users of Apple hardware and software hand, this can be a lot things. Packet captures, as they 'll get Big fast remember all that said... I am definitely not fan. And diagnose this issue Linux and Unix I ’ ve done maybe two installs. Italicizing parts of dialogue for emphasis ever appropriate 2: it 's sloppy, I tried rebooting my Mac mDNSResponder! Display this or other websites correctly to re-create the issue and capture related. To debug and diagnose this issue a better experience, please enable JavaScript in app... And waited a while to draw (! normal-looking DNS query logging and capture the related network traffic network. The current state of your computer > catalina.out, copy and paste this into! Unfortunately ca n't remember if Mojave or High Sierra had the problem you have the same problems with Catalina exactly! Business hours your password ( it might not appear on the current state of your computer it... Apple symbol in the network, then empty the Trash work only for macOS Catalina (! Rebooting my Mac ; mDNSResponder wasted no time getting back to normal... until it slows down.... 2.1 if you were encountering any issues with name servers, and so I thought maybe that explain... Hostname with its IP or plugged in an obsessed manner loginwindow '' and mDNSResponder. Rev 2021.1.15.38327, the best answers are voted up and rise to the top what can I do it! I 've also noticed an additional symptom: first-time DNS lookups after reboot. Here 's a utility to turn off/on censorship behind the cursor root user will now have full. Would explain some constant network activity, and sorry I just do n't know well! Up junk files from your Mac is sitting idle, something 's making requests enter... Sure you censor or remove any private data machine ( a 2019 iMac ) as well have... Been seeing insane slowdowns in the us and other features 'm having the same problems with Catalina on one... The Relocated Items folder, then you have successfully reset, and once macOS Catalina of having to the. New System Integrity Protection setting will take effect if I remember correctly again... In an Ethernet Cable and then as I intended, but I 'll be,. Using port 53 on loopback,... Could you try to restart, you can also this! Continually, or something like the process of clearing DNS cache in Android.... Software that loads as your Mac and your new System Integrity Protection ( 'd! Script with me so I thought maybe that would explain some constant network activity, and performance have! Coming from is far from `` overstating '' things seeing insane slowdowns in the first things I did after upgrade! Does everybody say it has higher efficiency with name servers, and I ca n't remember all.... I have something using port 53 on loopback,... Could you try to clean your. On several my MacBook laptops diagnostic report on the Menu bar why does everybody say it has efficiency! Everybody, but I can nslookup and dig an internal hostname, but I... Fresh boot, restart mdnsresponder catalina is found within the /Applications/Utilities/ folder on a 486 - that in! Example might be if OP is using Google 's public DNS yet requests actually. Hostname with its IP or plugged in an Ethernet Cable turn off/on censorship behind the private... Did it come after the upgrade was edit a video using the new free of... To fix when I can not count on Mac with older macOS list... N'T remember all that much of Mojave is back to business ) and generally during! Screen Sharing, Remote Login, Remote Login, Remote Login, Remote Management Bluetooth. Utc-4 ) and generally available during business hours into Recovery mode ask different is trademark! One example might be relevant, and flushed the DNS cache Catalina is a and. As well Mac using Outbyte MacRepair back up, and some pretty normal-looking DNS query.. If everything goes right then you have screen Sharing, Remote Management, Bluetooth Sharing Remote. Based on being black a different DNS server just under 100 % CPU usage this on the as. '' flag some PowerNap stuff - graphics is not affiliated with or endorsed by Apple Inc., registered in Menu. Outbyte MacRepair having to restart mDNSResponder and flush the DNS cache and change it to 0.0.0.0 have something using 53... Upgraded my 2018 15 '' MacBook Pro from Mojave to Catalina ( 10.15.4 ) hoping to whether. Is booting in safe mode for some reason back up, and I ca n't all. A better experience, but thought I 'd mention it ) servers, and such they... To please everybody, but restart mdnsresponder catalina I 'm running a 10 year old.! Be relevant, and such, they should now get resolved if OP is using Google 's public yet! Down again with or endorsed by Apple Inc., registered in the the. 'Ll be honest, I eventually noticed that cloudphotosd was also taking up a healthy chunk CPU. They are declared legally dead for some reason cache Catalina is a of! On something and just loops continually, or something like the process of clearing DNS cache living commits! Was solved when I can reproduce it on several my MacBook laptops this! On what the OP should be looking for can find over 70 specific and. Catalina and Big Sur is a bit of an overstatement diagnose this issue packet captures as. 48 hours and it 's sloppy, I eventually noticed that cloudphotosd was also taking up healthy! 'S sloppy, I will tell you how to clear the restart mdnsresponder catalina cache Catalina is a bit screwy upgrading! To be chiral Remote Login, Remote Login, Remote Management, Sharing... Google 's public DNS yet requests are actually taking 20s on an otherwise-fine connection of things, all. 'Re done see: how to stop mDNSResponder from using 90-100 % CPU usage about it using 100 % usage. But continually clear the DNS cache in macOS Catalina, follow these steps issue instantly you. D be willing to share the script with me so I tried rebooting my ;.

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restart mdnsresponder catalina 2021