Extension 503 error

[eatnug]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

I’m working on an extension and I’ve published it on both VS marketplace and Open VSX registry. but when I access that extension in cursor marketplace, page returns 503 unlike in vscode.

Steps to Reproduce

just search sidecar in cursor extension marketspace

Screenshots / Screen Recordings

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.1.41
VSCode Version: 1.105.1
Commit: 1321aa9140784391e83a406174345e818fe156f0
Date: 2025-11-30T18:58:57.968Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 25.2.0

Does this stop you from using Cursor

No - Cursor works, but with this issue

[deanrie]

Hey, thanks for the report, I’ll pass it to the team.

[eatnug]

thanks!

[MaxT (Max)]

Kilo Code is another one that throws a 503

[ravirahman]

Should be fixed now – could you try again? Thanks for bringing this issue to our attention.

[eatnug]

wow thanks it works now

[Jannie_Gill]

Nice! So happy you figured that out!

That 503 “Service Unavailable” error is super confusing when it’s caused by being on the wrong login page entirely. It really makes you think the backend server is down, when in reality, it’s just rejecting the request because the login credentials don’t match that specific service endpoint.