Mac keeps losing internet connection - Resolving Host

I think the problem was a corrupted cookies folder in my User library. I guess I previously just deleted cookies within Safari? At any rate while using trial and error copying my library to a clean install, this seemed to be the problem, so I deleted it from my main user and the internet seems to be working normally again. I don't really understand how this affected bittorrent and my Mail's ability to load images from the web but if it works, it works.

It looks like I spoke too soon. After a reboot Safari is working but I'm back to having no images in Mail, Chrome can't connect at all and Skype says "Skype home unavailable." So something is still blocking my connections or mis-prioritzing them. Though I fixed the "cookies" issue on Safari that I mentioned above.

I actually had setup a firewall to only allow these apps to make sure nothing else was interfering.

Since I am having internal hard drive issues and am currently running off an external, I guess I will just wipe my internal and install a new system with El Capitan and hope I can get everything back in order through Time Machine without replicating this problem.

I think I finally solved the problem. The above fixed Safari's cookie error but no other app was connecting. I was researching a different issue and realized I needed to check my LaunchAgents and LaunchDaemons which seemed like the type of thing that would be causing this problem. Also a few kernel extensions that seemed extraneous. I deleted the following and now all apps seem to connect fine:

/Library/LaunchAgents/com.adobe.AAM.Updater-1.0.plist

/Library/LaunchDaemons/at.obdev.littlesnitchd.plist

/Library/LaunchDaemons/com.adobe.SwitchBoard.plist

/Library/LaunchDaemons/com.adobe.versioncueCS3.plist

/Library/LaunchDaemons/com.microsoft.office.licensing.helper.plist

/Library/Extensions/LittleSnitch.kext/

~/Library/LaunchAgents/com.adobe.AAM.Updater-1.0.plist

~/Library/LaunchAgents/com.adobe.ARM.df0ab5bbe6f698196fcc21e3c1e66dcb758bd911f4d 637272d9d8109.plist

~/Library/LaunchAgents/com.spotify.webhelper.plist

~/Library/LaunchAgents/com.valvesoftware.steam.ipctool.plist

I think that was everything. The likely culprit would be Little Snitch but I wasn't running it (though I did use it to troubleshoot this issue months ago) so maybe something was corrupted and interfering in the background. None of the user items seem like they would really cause this, but it is strange that I wasn't getting the problem when I created a new user but when I copied my user folder over it started again. So I would think it was in the user folder, but who knows. It's working for now.

One other thing, the problem I was having with uTorrent was actually an unrelated problem that had to do with flushing the files to disk, apparently the version of uTorrent I was using gets caught up while writing and slows itself down automatically. But when I mentioned above that it wasn't working, it would say "cannot connect to host" at all and then miraculously would start connecting hours later (like Mail and Skype would). Just wanted to clarify that if anyone uses this for future reference.

Running Yosemite (till tonight) on my MBP.

I've been having this problem for a while now, and this post got me looking at the LaunchDaemons. Wasn't sure about the little snitch after reading what it did, so looked at the others. The one that jumped out at me was my cisco anyconnect daemon which I installed for VPN access. I rarely use the VPN, and think I can do it without anyconnect anyway, so I deleted anything in all those directories that said anyconnect and rebooted.

Problem gone.

PROBLEM SOLVED.

I have had this same resolving host issue for months on my MacBook Pro connecting to Virgin Media. To say it has been driving me mad is an understatement. The iPhone and iPad worked just fine as did any other lap top or device that I brought into the wifi zone.

Things I tried:

1. Cleared browser caches, tried different browsers
2. Virus scanned the Mac
3. Changed the wifi channels – tried all channels on the wifi
4. Turned off router firewall, post scan detection and IP Flood detection and enabled all pass through options
5. Put router into modem mode and bought an Airport Extreme
6. Changed DNS to Google 8.8.8.8
7. Replaced the router
8. Been on the phone to virgin tech support for an hour.

None of these worked until I read the above thread and pin pointed the culprit to be some VPN software that I had installed 6 months ago. Buried in the Library under LaunchDaemons and PriviledgedHelperTools were files like com.purevpn.macapp and com.purevpn.macapp.plist

I no longer use the VPN software and so removed the files - I had to use sudo rm com.purevpn.macapp to ensure I had administrator rights to really delete the files. I rebooted the Macbook and now all is fixed.

mikengray wrote:

I definitely think this is a Mavericks issue. My iMac running Mavericks is the ONLY system in the house that drops the network randomly while all other systems never lose the network. No idea how to resolve this, but here is the workaround I'm posting:

I've had the 'network drop' issue with my Airport Extreme for the last 2 months. It reconnects when I pull the ethernet cable and plug it back in. I've tried downgrading the AE firmware, resetting to factory, etc. Nothing worked. I finally threw in the towel and created a script that monitors my network connectivity and restarts my interface if it senses it has dropped:

##############

#!/bin/ksh

while true

do

yup=`ping -c1 -t2 www.google.com|grep from`

if [[ -n $yup ]]

then echo "Internet is connected!"

else

ifconfig en0 down; ifconfig en0 up

echo "Down at `date +%m%d%Y%H%M%S`">>./dropped.out

fi

sleep 5

clear

done

###############

I know its a workaround, but its saving me the headache of constantly pulling my cable and putting it back in!

Good luck!

-Mike Gray

Macbook Pro mid 2015 Yosemite. Virgin Media Super Hub 2 here in the UK.

mikengray's solution from another thread is the only thing that worked for me. I modified the script as 'ifconfig up/down' required root privilages so this uses the 'networksetup' command. This script seems to do a decent job at reconnecting after sleeping the laptop. Now I don't have to right-click disconnect/reconnect the WIFI every 5 minutes. Also this script keeps a log in the home folder of all the dropouts. Looking at the log for yesterday there are over 100 dropouts throughout the day.

Put this in a textfile 'keepalive-script' in your home folder and 'sudo chmod +x ~/keepalive-script' it in the terminal to make it executable on double-click. I moved mine to the desktop and run it when I log in, leaving it on in the corner of the screen...

I just bought a new MacBook Pro and I am constantly losing Wi-Fi connection. I have an Apple router and this is a new machine fully updated. Why is this happening?

I just bought a new Motorola modem and Airport Extreme. Once I got them set up with Cox/Apple help, my Internet kept disconnecting, being unable to find the DNS server address and showing a "resolving host" on the window. It would correct for a short while if I unplugged/replugged in the above devices. I called Cox this am, and here's what she told me to do: open the AirPort utility, and click on the Extreme picture. The little window that appears with have an edit button at the bottom. Click on it. On that window, click on Internet, then Internet Options at the bottom. Change Configure IPv6 to Link-local only. Save and/or update. This may be unique to Cox subscribers, and it has worked for me thus far.

No fix worked for me after weeks of trying. I wrote a script that works around the issue. It's more or less like the scripts posted earlier, but unlike the above scripts, it doesn't doesn't restart your internet connection (thus causing a noticeable disruption in your connection). Plus the above scripts don't account for other random connection issues like getting disconnected from the router. According to my program, I've had 388 failures (wifi drops) in the last 91 hours, and did not notice a single one. This program will need to be customized for your SSID (because it usually only happens in one location, but I can easily make it work for any), so email me at mac.wifi.fix@gmail.com and I can help you out. I'm not selling the script, but donations are appreciated 🙂

Spend a couple hours on the phone with Apple support. Isolated the issue to the Norton security suite that came included with Comcast internet. Uninstalled it all things are working well so far.

This is an exact description of the problems I've been having, although I'm on El Capitan. Turning the wifi off and on again solves it, but it's maddening having to do this every ten minutes or so. Did you have any luck finding a solution?

You might want to consider starting a new discussion. Since this one is a couple of years old, less people are likely to look at it. You can link to this one. Post in the El Capitan community and include an Etrecheck report.

Etrecheck – System Information

The Fix:

• Disable WiFi
• Open Finder
• Press

  Cmd+Shft+G

  to go to the folder

  /Library/Preferences/SystemConfiguration/

• Delete (or move) the following files:

  • com.apple.airport.preferences.plist

  • NetworkInterfaces.plist

  • preferences.plist

• Restart your computer
• Re-enable WiFi

The Other Things I Tried:

• Reset

  PRAM

• Reset

  SMC

• Used Onyx to clear caches, run update scripts, etc.
• Disabled AirDrop by using Terminal to run

  sudo ifconfig awdl0 down

• Kext Utility to reset kext permissions, followed by...
• Disk Utility to verify/correct permissions.
  • In my case errors were found, and I had to...
  • Reboot in Recovery Mode (press Cmd+R as boot sound, hold until you see the Applelogo), use Disk Utility, however no errors were detected
  • Disabled FileVault, waited for decryption to complete
  • Reboot in Recovery Mode, use Disk Utility, some errors corrected then

    return value 8

    and was told I had to backup, format, and restore to the drive.
  • Ran Disk Utility repair again and no errors were detected (then I ran it again for good measure)
  • Rebooted and Disk Utility found no errors.
  • Still had WiFi disconnects...
• Deleted the AirPort plist files (fix above) and WiFi has been stable.

Yikes, filled your instructions and now my email isn't working!!