DNS resolution issue with Azure OpenAI provider when running in WSL

What version of Codex is running?

0.60.1

What subscription do you have?

Azure OpenAI

Which model were you using?

gpt-5.1-codex

What platform is your computer?

Ubuntu via WSL

What issue are you seeing?

Connection failed: error sending request for url (https://{{{endpoint}}}}.openai.azure.com/openai/responses?api-
version=2025-04-01-preview)

What steps can reproduce the bug?

Platform: WSL on Windows Issue #1552 details a number of general issues related to the Azure OpenAI service provider. I'm opening this issue to focus specifically on a DNS resolution problem that appears to be affecting many users.

What is the expected behavior?

The connection should work.

Additional information

@doggy8088 has done some great analysis and has provided details here in the thread. For convenience, I'm pasting the workaround suggested in the other thread.

# Workaround To work around the issue, you can add a statically mapped DNS record to the /etc/hosts file. `` # This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf: # [network] # generateHosts = false 127.0.0.1 localhost <feff> 127.0.0.1 localhost # 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 # Add this line below. Make sure the IP is correct. 20.232.91.180 test.openai.azure.com ``

Note: This has been previously been reported and was tracked on #1552 but was then closed out and a new issue was opened #6116 but that was also closed out. As requested by @etraut-openai I am opening a new issue.