Connection Erro while trying to use any model from the IDE

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Connection Error (Connection failed. Please try again, or contact support if the issue persists.)

I’ve tried a lot of times. I haven’t been able to use Cursor for about 9 days now, regardless of the model I use (I’ve tried all of them).

Steps to Reproduce

Just send a prompt to any model from de IDE

Expected Behavior

The model should do the described task from the prompt sent

Screenshots / Screen Recordings

Operating System

Windows 10/11

Version Information

Version: 3.22.7 (user setup)
VS Code Extension API: 1.128.0
Commit: 37076c6c3f9e253c0fa2305197e45befd13a2260
Date: 2026-09-24T05:01:24.589Z
Layout: IDE
Build Type: Stable
Release Track: Default
Electron: 42.10.0
Chromium: 148.0.7778.280
Node.js: 24.18.1
V8: 14.8.178.38-electron.0
xterm.js: 6.1.0-beta.291
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

All of them

Does this stop you from using Cursor

Yes - Cursor is unusable

Hey, thanks for the report and the screenshot. What you’re seeing isn’t a problem with your network and it doesn’t depend on the model, so everything fails the same way. This is a known issue on Windows. The component that starts the Agent inside the IDE doesn’t start, so messages never leave your computer. We’re tracking it.

Most of the time this is fixed by installing a missing Microsoft runtime. Please try these steps:

  1. Fully close Cursor, open Task Manager, and end any remaining Cursor processes.
  2. Download the latest Microsoft Visual C++ Redistributable x64: https://aka.ms/vs/17/release/vc_redist.x64.exe
  3. Run the installer. If it says it’s already installed, choose Repair.
  4. Restart your computer.
  5. Open Cursor, create a new chat, and send a short hello.

If it still doesn’t work, open Help > Toggle Developer Tools > Console, send a message in the chat, and paste the lines that mention cursor-agent-host or native binding. That’ll make it clearer what exactly isn’t loading.

Let me know how it goes.

Thank you! It worked