Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
Hi everyone,
I’m running into a persistent issue with Cursor that started immediately after a recent update, and I’ve been unable to resolve it despite extensive troubleshooting.
Problem description
Cursor fails to connect due to an SSL/TLS handshake error. Most AI-related features don’t work (chat, agent, API checks), and network diagnostics consistently report an SSL handshake failure.
Typical error looks like:
SSLV3_ALERT_HANDSHAKE_FAILURE (alert number 40)
What I’ve already tried:
Fully updated Windows
Disabled antivirus and Windows Firewall
Ran Cursor as administrator
Logged out and logged back in
Reinstalled Cursor (latest version)
Installed a newer Cursor update when it became available (still broken)
Tried switching AI models (same result)
Created and tested under a separate Windows user account → same issue
The problem persists across restarts and clean installs
Important detail:
The issue started right after a Cursor update. Cursor was working normally before that.
Also worth noting:
The problem reproduces on multiple Windows user accounts
Reinstalling Cursor did not help
This strongly suggests it’s not related to local user settings or corrupted app data
At this point I’m out of ideas on the client side.
Has anyone else encountered a similar SSL/TLS handshake issue with Cursor recently?
Is this a known problem, or is there any workaround I might be missing?
Any insight from Cursor devs or other users would be greatly appreciated, as this is currently blocking my work.
Thanks!
Steps to Reproduce
Steps to reproduce
Install Cursor (latest stable version) on Windows.
Launch Cursor and log in to an account.
Open any project (or even without a project).
Try to use any AI feature, for example:
Open the Chat / Agent panel
Send any message (e.g. “Hello”)
Cursor immediately fails with a server/network error.
Go to Cursor Settings → Network.
Click “Run Diagnostics” / “Check Network Connections”.
Diagnostics report SSL/TLS errors (SSL handshake failure) for multiple services (API, Chat, Agent, Ping).
Result:
AI features do not work. Network diagnostics consistently show SSL handshake errors.
Expected Behavior
Cursor successfully connects to backend services and AI features work normally.
Screenshots / Screen Recordings
Operating System
Windows 10/11
Version Information
Version: 2.4.22 (user setup)
VSCode Version: 1.105.1
Commit: 618c607a249dd7fd2ffc662c6531143833bebd40
Date: 2026-01-26T22:51:47.692Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.26100
For AI issues: which model did you use?
Auto
Does this stop you from using Cursor
Yes - Cursor is unusable