WSL2 - Temporary failure in name resolution

[brvaland]

Hi,

I have installed WSL2 and Ubuntu 20.04 on Windows 10 (1909 - OS Build 18363.1379) and having issues with DNS. I tried the ping command ping google.com and got an error ping: google.com: Temporary failure in name resolution.

I did try few things but no luck

• Updated Windows Subsystem for Linux Update - 5.4.91
• Configured wsl.conf & resolv.conf as below and restarted with wsl --shutdown :

administrator@TEMPPC:/etc$ cat wsl.conf
[network]
generateResolvConf = false 

administrator@TEMPPC:/etc$ cat resolv.conf
nameserver 8.8.8.8
nameserver 1.1.1.1

• ping to nameserver works fine

administrator@TEMPPC:/etc$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=115 time=39.9 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=115 time=21.5 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=115 time=20.7 ms
--- 8.8.8.8 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4006ms
rtt min/avg/max/mdev = 19.394/24.707/39.909/7.651 ms

administrator@TEMPPC:/etc$ ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
64 bytes from 1.1.1.1: icmp_seq=1 ttl=57 time=40.9 ms
64 bytes from 1.1.1.1: icmp_seq=2 ttl=57 time=29.1 ms
64 bytes from 1.1.1.1: icmp_seq=3 ttl=57 time=24.1 ms
--- 1.1.1.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 16.177/27.574/40.872/8.958 ms

I have Symantec Endpoint Security and Cisco AnyConnect for VPN, I tried to connect/disconnect from VPN and that did not make any difference to dns resolution.

Finally i tried to set Ubunto distro version WSL 1 and that works fine so not sure why WSL 2 fails.

Any suggestion will be appreciated.

[therealkenc]

Landing zone for Anyconnect /dupe #4277 (plus #5068 etc).

[ghost]

Hi! We've identified this issue as a duplicate of another one that already exists in this repository. This specific instance is being closed in favor of tracking the concern over on the referenced thread.

Thanks for your report!

[chuck-wood]

This is NOT a dupe of #4277 . That issue is about not being able to connect to the internet at all when behind a VPN. This issue is about DNS not working.

[lKrayola]

Same problem, one day suddenly DNS inside wsl2 stopped working, but pings to ips work fine

[chuck-wood]

Same problem, one day suddenly DNS inside wsl2 stopped working, but pings to ips work fine

Look at https://superuser.com/questions/1533291/how-do-i-change-the-dns-settings-for-wsl2 for a workaround.