Getting DNS errors on latest WSL pre-release

[marcmv1]

Windows Version

Microsoft Windows [Version 10.0.22631.3296]

WSL Version

2.2.1.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

5.15.150.1-microsoft-standard-WSL2 #1 SMP Thu Mar 7 03:22:57 UTC 2024 x86_64 GNU/Linux

Distro Version

Fedora 39

Other Software

N/A

Repro Steps

host is returning too much info and appending the entries from domain search listed in /etc/resolv.conf

host www.microsoft.com
www.microsoft.com is an alias for www.microsoft.com-c-3.edgekey.net.
www.microsoft.com-c-3.edgekey.net is an alias for www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net is an alias for e13678.dscb.akamaiedge.net.
e13678.dscb.akamaiedge.net has address 23.197.181.184
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:2000:198::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:2000:182::356e
;; ;; Question section mismatch: got e13678.dscb.akamaiedge.net.random.com/MX/IN
;; communications error to 10.255.255.254#53: timed out
;; ;; Question section mismatch: got e13678.dscb.akamaiedge.net.random.com/MX/IN
;; communications error to 10.255.255.254#53: timed out
;; no servers could be reached

When I do host followed by a DNS server, output is as it should be
host www.microsoft.com 1.1.1.1
Using domain server:
Name: 1.1.1.1
Address: 1.1.1.1#53
Aliases:

www.microsoft.com is an alias for www.microsoft.com-c-3.edgekey.net.
www.microsoft.com-c-3.edgekey.net is an alias for www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net is an alias for e13678.dscb.akamaiedge.net.
e13678.dscb.akamaiedge.net has address 23.197.181.184
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:2000:198::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:2000:182::356e

Expected Behavior

This is how it should look
host www.microsoft.com 1.1.1.1
Using domain server:
Name: 1.1.1.1
Address: 1.1.1.1#53
Aliases:

www.microsoft.com is an alias for www.microsoft.com-c-3.edgekey.net.
www.microsoft.com-c-3.edgekey.net is an alias for www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net is an alias for e13678.dscb.akamaiedge.net.
e13678.dscb.akamaiedge.net has address 23.197.181.184
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:2000:198::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:2000:182::356e

Actual Behavior

This is how it does look

host www.microsoft.com
www.microsoft.com is an alias for www.microsoft.com-c-3.edgekey.net.
www.microsoft.com-c-3.edgekey.net is an alias for www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net is an alias for e13678.dscb.akamaiedge.net.
e13678.dscb.akamaiedge.net has address 23.197.181.184
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:2000:198::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:2000:182::356e
;; ;; Question section mismatch: got e13678.dscb.akamaiedge.net.random.com/MX/IN
;; communications error to 10.255.255.254#53: timed out
;; ;; Question section mismatch: got e13678.dscb.akamaiedge.net.random.com/MX/IN
;; communications error to 10.255.255.254#53: timed out
;; no servers could be reached

Diagnostic Logs

No response

[github-actions]

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Invoke-WebRequest -UseBasicParsing "https://raw.githubusercontent.com/microsoft/WSL/master/diagnostics/collect-wsl-logs.ps1" -OutFile collect-wsl-logs.ps1
Set-ExecutionPolicy Bypass -Scope Process -Force
.\collect-wsl-logs.ps1

The scipt will output the path of the log file once done.

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View similar issues

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one and thumbs upping the other issue to help us prioritize it!

Open similar issues:

• Cisco Anyconnect blocks DNS access from WSL2 (#11075), similarity score: 0.72
• WSL 2.0.9 update breaks DNS resolution and prevents connectivity including pings and downloads (#10900), similarity score: 0.70

Closed similar issues:

• DNS Resolution not working on Windows build 22533.1001 (#7938), similarity score: 0.72
• WSL 2 DNS resolver is completely confused, reports addresses of zone nameservers, not just addresses of destination host (#6051), similarity score: 0.72
• WSL 2 DNS not working (#4855), similarity score: 0.71

Note: You can give me feedback by thumbs upping or thumbs downing this comment.

[zcobol]

@marcmv1 are you using networking mirrored mode or NAT? And if you disable dnsTunneling does it make any difference? On Windows 10 and WSL 2.2.1.0 it works as you expected:

[zcobol@toto ~]$ host www.microsoft.com
www.microsoft.com is an alias for www.microsoft.com-c-3.edgekey.net.
www.microsoft.com-c-3.edgekey.net is an alias for www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net is an alias for e13678.dscb.akamaiedge.net.
e13678.dscb.akamaiedge.net has address 23.197.102.50
e13678.dscb.akamaiedge.net has IPv6 address 2600:1405:1800:18c::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1405:1800:195::356e

[zcobol@toto ~]$ host www.microsoft.com 1.1.1.1
Using domain server:
Name: 1.1.1.1
Address: 1.1.1.1#53
Aliases:

www.microsoft.com is an alias for www.microsoft.com-c-3.edgekey.net.
www.microsoft.com-c-3.edgekey.net is an alias for www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net is an alias for e13678.dscb.akamaiedge.net.
e13678.dscb.akamaiedge.net has address 23.197.102.50
e13678.dscb.akamaiedge.net has IPv6 address 2600:1405:1800:195::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1405:1800:18c::356e

On Win10 networkingMode = mirrored is not available.

[benhillis]

@CatalinFetoiu - can you please investigate?

[marcmv1]

@zcobol,

I don't know why cmd gave me windows 10 LOL. I'm on Windows 11 23H2 OS build 22631.3296.

Here's the output with dnsTunneling=false in .wslconfig

host www.microsoft.com
www.microsoft.com is an alias for www.microsoft.com-c-3.edgekey.net.
www.microsoft.com-c-3.edgekey.net is an alias for www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net is an alias for e13678.dscb.akamaiedge.net.
e13678.dscb.akamaiedge.net has address 23.197.181.184
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:4000:591::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:4000:58e::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:4000:58c::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:4000:58f::356e
e13678.dscb.akamaiedge.net has IPv6 address 2600:1401:4000:58d::356e

[CatalinFetoiu]

@marcmv1 thanks for reporting the issue

can you please collecting networking logs using instructions below? https://github.com/microsoft/WSL/blob/master/CONTRIBUTING.md#collect-wsl-logs-for-networking-issues

the script will generate a file with name starting with "WslNetworkingLogs"

[chrisk314]

I was also having issues after updating to the 2.2.1 pre-release version. Some web requests were working but others failing with network issues. I've now resolved the issues and have DNS tunneling and network mirroring working. Here's what I did.

Changes to global WSL config...

# .wslconfig
[wsl2]
networkingMode = mirrored
dnsTunneling = true
# ...

Changes in my Ubuntu 22.04 distro...

# /etc/wsl.conf
[network]
generateHosts = false
generateResolvConf = false
# ...

Reset the /etc/hosts entries in my Ubuntu 22.04 distro (myhostname is a placeholder)...

127.0.0.1       localhost
127.0.1.1       myhostname

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

Reset the /etc/resolv.conf entries in my Ubuntu 22.04 distro...

nameserver 8.8.8.8

After running wsl.exe --shutdown and then restarting my Ubuntu 22.04 distro everything seems to be working correctly as far as I can tell. I'm able to successfully curl a service running on my Windows localhost from a shell inside Ubuntu. I can also successfully make web requests from inside Ubuntu now. Earlier in the day a terraform apply was consistently failing after the update to 2.2.1, now it's all good!

Hope this can help someone else!