AI Pane Not Working - Error : certificate signature failure

Bug Reports
1

Describe the Bug

Having error check the screenshot.

Steps to Reproduce

message Hi, it takes time than shows the error message.

Screenshots / Screen Recordings

Screenshot 2025-07-03 130639.png
Screenshot 2025-07-03 130639.png655×315 11.5 KB

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.2.1 (user setup)
VSCode Version: 1.99.3
Commit: 031e7e0ff1e2eda9c1a0f5df67d44053b059c5d0
Date: 2025-07-03T06:16:02.610Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

Hi @Babu_Kannar and welcome to Cursor Forum

Thank you for the bug report. The details from your screenshot show that something is interfering with the network requests as it changes certificate signature which is not a good sign.

Are you using Cursor on a corporate network? Corporate networks may do similar changes to HTTPS requests.

Sometimes switching in Settings > Network to http1.1 helps avoid this issue.

Please perform also there a Run Diagnostics to check what is affected by your network.

3

Its working now with http/1.1.

But why not working with http/2?

4

Because something on your internet connection is interfering with the SSL certificates as shown in your screenshot.

“certificate signature failure” means that something is replacing valid certificates with custom certificates that are invalid.

This was reported before already by users on corporate networks where the company makes such alterations. Some internet providers may also do this.

Therefore the error message.