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Codex Windows App fails in WSL with "invalid transport in mcp_servers.codex_app" #40829
Description
What version of the Codex App are you using (From “About Codex” dialog)?
26.820.60940
os
win11 + wsl 26.04
Description
Codex Windows App fails to start a local task when using a WSL workspace.
The error is:
failed to load configuration: invalid transport
in `mcp_servers.codex_app`
[electron-message-handler] Request failed
error={
"code": -32600,
"message": "failed to load configuration: invalid transport\nin `mcp_servers.codex_app`\n"
}
failureReason=invalid_config
method=thread/start
invalid transport in `mcp_servers.codex_app`
Activity
github-actions commentedon Aug 26, 2026
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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taobaibais commentedon Aug 26, 2026
I can confirm the same regression on Windows 11 + WSL2 with Codex Desktop 26.820.x. Both creating new chats and resuming existing chats fail with
invalid transport in mcp_servers.codex_app, while my userconfig.tomlhas nomcp_servers.codex_appentry. WSL is my required development environment, so switching the agent to Windows-native is not a viable workaround for me. This is a complete work blocker.taobaibais commentedon Aug 26, 2026
Given that this regression completely blocks a supported development workflow for paying users, OpenAI should also consider compensation for affected accounts. At minimum, users impacted by the WSL outage should receive additional/banked usage resets (or equivalent credits) for the period in which Codex Desktop was unusable in their required environment. We are paying for access to this service, and a release regression that prevents all new/resumed WSL chats from working should not consume users' paid usage window without remedy.