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Windows 11 Pro DNS resolution suddenly fails, IP Connectivity still works

Anonymous
2024-09-02T17:02:07+00:00

Good afternoon! I've seen many posts around regarding Windows 11 and DNS seemingly stopped working. I'm having a similar issue however, I have validated that IP connectivity on my internal network, as well as to the Internet is still functioning.

  1. OS: Windows 11 Pro - fully up to date
  2. Intel WIFI AX 201 Adaptor (HP Laptop) running the lastest Intel driver from 8/20/2024
  3. Asus ZEN WIFI AX RT8 mesh network running the latest firmware

Troubleshooting steps and remediation steps taken:

  1. Opened the command prompt and ping several IP Address on my home network (printers, gateway, other devices) as IP Addresses on the Internet (modem gateway, 8.8.8.8, 1.1.1.1, etc), all successfully.
  2. Via the command prompt, ran nslookup on www.google.com, www.microsoft.com, hp.com and cnn.com. nslookup failed each time.
  3. Uninstalled the WIFI driver, rebooted Windows 11, installed the latest WIFI driver, rebooted Windows 11.
  4. Within minutes, DNS resolution started having issues.
  5. Verified 2 desktop PCs running Windows 11 Pro, a second laptop running Windows 11 Pro and two employer provided Windows 10 Pro laptops were functioning as expected (able to browse the internet, able to access various Internet based resources).
  6. Flushed DNS cache
  7. Verified power settings to now place the WIFI adaptor into a shutdown or low power mode.
  8. Rebooted the primary WIFI router and the AIMesh access point.
  9. Forced the laptop to connect to a specific WIFI Access Point to rule out the network.
  10. Changed DNS to use public DNS 8.8.8.8 and 1.1.1.1.

At this point, it is only one Windows 11 Pro system having an issue. The only resolution seems to be rebooting the laptop, which will resolve the issue for a few minutes to a couple of hours. At this point, even searches for this issue hasn't revealed any recommended resolutions that I haven't already tried (see above). I'm open to ideas.

Thanks!

Paul

Windows for home | Windows 11 | Internet and connectivity

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  1. Anonymous
    2024-09-04T18:46:03+00:00

    Okay so i think i've found the cause of my issue. I spotted the following in the event logs:

    A request to allocate an ephemeral port number from the global TCP port space has failed due to all such ports being in use.

    TCP/IP failed to establish an outgoing connection because the selected local endpoint was recently used to connect to the same remote endpoint. This error typically occurs when outgoing connections are opened and closed at a high rate, causing all available local ports to be used and forcing TCP/IP to reuse a local port for an outgoing connection. To minimize the risk of data corruption, the TCP/IP standard requires a minimum time period to elapse between successive connections from a given local endpoint to a given remote endpoint.

    I spotted the EA app running under xbox had a lot of network activity. killing it fixed my issue. it seems that for whatever reason the EA app was unable to connect, and does not seem to be disposing connections properly, leaving them orphaned. Which now makes sense why already established connections (like teams etc) were working fine. So though it looked like a DNS issue. it was a TCP allocation issue in my case.

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  2. Anonymous
    2024-09-04T13:19:11+00:00

    I'm having the exact same issue.

    I thought i was going mad. I even resulted to plaintext dns - same issue. And the last last resort was using the DHCP dns (ISP) same issue. I have confirmed the issue lies with the windows 11 system and not the network as all other devices are working fine. Oddly most of MSTeams is working, and Youtube for some reason.

    So far the only fix is a reboot but this is getting annoying now.

    1 person found this answer helpful.
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