An unexpected error occurred on our servers. Please try again, or contact support if the issue persists. - Error

[Chandan_HS]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Im getting error, something like below with Request ID: 274f2b4f-a150-422e-b72e-f45db2db5279
[unknown] HTTP 303
die: [unknown] HTTP 303
at n5A (vscode-file://vscode-app/c:/Users/10850613/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34249:23755)
at e5A (vscode-file://vscode-app/c:/Users/10850613/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34249:22658)
at l5A (vscode-file://vscode-app/c:/Users/10850613/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34250:6285)
at _ou.run (vscode-file://vscode-app/c:/Users/10850613/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34250:10400)
at async vOa.runAgentLoop (vscode-file://vscode-app/c:/Users/10850613/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:46813:9906)
at async I3u.streamFromAgentBackend (vscode-file://vscode-app/c:/Users/10850613/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:46867:9277)
at async I3u.getAgentStreamResponse (vscode-file://vscode-app/c:/Users/10850613/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:46867:13639)
at async bMe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Users/10850613/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:34310:17597)

Cursor version : 2.6.11

Steps to Reproduce

Ask any question in the chat window I get this error

Operating System

Windows 10/11

Version Information

Version: 2.6.11 (user setup)
VSCode Version: 1.105.1
Commit: 8c95649f251a168cc4bb34c89531fae7db4bd990
Date: 2026-03-03T18:57:48.001Z
Build Type: Stable
Release Track: Default
Electron: 39.6.0
Chromium: 142.0.7444.265
Node.js: 22.22.0
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26100

Does this stop you from using Cursor

Yes - Cursor is unusable

[deanrie]

Hey, this is almost certainly a corporate proxy or firewall on your side. HTTP 303 is a redirect, and it’s not coming from our servers. Most likely, SSL inspection on your network is intercepting requests to the Cursor API.

Here’s what can help:

• Check without VPN or proxy: temporarily turn off the corporate VPN and try again. If it works, that confirms the cause.
• Ask IT to add Cursor to the bypass list (best fix): they should exclude these domains from SSL inspection:
  • *.cursor.sh
  • *.cursor.com
  • *.anysphere.co
• Try disabling HTTP/2: Settings → Network → HTTP/2 Compatibility Mode. Not guaranteed, but it sometimes helps with proxies.
• Run Network Diagnostics: Cursor Settings → Network → Run Diagnostics. Share a screenshot of the results, it’ll show where the connection drops.

Similar corporate network case: An unexpected error occurred on our servers. Please try again, or contact support if the issue persists

Let me know what you see when you test without VPN.