Cursor lost connection with no reasons 🐞

Support Bug Reports
1

Cursor lost connection to the workspace while starting tool execution. Reload the window and try again.
why this happens

cursor is fresh install and connection is good

Version: 3.12.17 (system setup)
VS Code Extension API: 1.128.0
Commit: 0fb762053c34788bb7760d5673f8a6d4c8589d50
Date: 2026-07-17T02:53:53.006Z
Layout: IDE
Build Type: Stable
Release Track: Default
Electron: 40.10.3
Chromium: 144.0.7559.236
Node.js: 24.15.0
V8: 14.4.258.32-electron.0
xterm.js: 6.1.0-beta.256
OS: Windows_NT x64 10.0.26200

image
image996×140 6.58 KB

Cursor Network Diagnostic Results

DNS: Success
Logs:
[2026-07-17T14:58:26.421Z] Host: api2.cursor.sh
[2026-07-17T14:58:26.421Z] Servers: 127.0.0.1
[2026-07-17T14:58:26.421Z] Resolved to 100.30.0.180 in 11ms
[2026-07-17T14:58:26.630Z] Resolved to 100.30.0.180 in 207ms
[2026-07-17T14:58:26.630Z] Resolved to 100.30.0.180 in 0ms
[2026-07-17T14:58:26.630Z] Resolved to 100.30.0.180 in 0ms
[2026-07-17T14:58:26.705Z] Host: api2.cursor.sh
[2026-07-17T14:58:26.705Z] Servers: system
[2026-07-17T14:58:26.705Z] Resolved to 100.30.0.180, 35.173.141.123, 34.230.221.255, 100.30.42.99, 100.52.90.66, 54.204.41.98, 52.54.40.238, 100.56.150.191 in 75ms
[2026-07-17T14:58:26.705Z] Resolved to 100.30.0.180, 35.173.141.123, 34.230.221.255, 100.30.42.99, 100.52.90.66, 54.204.41.98, 52.54.40.238, 100.56.150.191 in 0ms
[2026-07-17T14:58:26.706Z] Resolved to 100.30.0.180, 35.173.141.123, 34.230.221.255, 100.30.42.99, 100.52.90.66, 54.204.41.98, 52.54.40.238, 100.56.150.191 in 1ms
[2026-07-17T14:58:26.706Z] Resolved to 100.30.0.180, 35.173.141.123, 34.230.221.255, 100.30.42.99, 100.52.90.66, 54.204.41.98, 52.54.40.238, 100.56.150.191 in 0ms
[2026-07-17T14:58:26.706Z] Result: true

HTTP/2: Success
Logs:
[2026-07-17T14:58:26.408Z] Start
[2026-07-17T14:58:26.703Z] Host: api2.cursor.sh
[2026-07-17T14:58:26.703Z] Protocol: h2
[2026-07-17T14:58:26.703Z] Result: true in 295ms

SSL: Success
Logs:
[2026-07-17T14:58:26.409Z] Start
[2026-07-17T14:58:26.868Z] URL: https://api2.cursor.sh/
[2026-07-17T14:58:26.868Z] Status: 200
[2026-07-17T14:58:26.868Z] IP: 100.30.0.180
[2026-07-17T14:58:26.868Z] Issuer: C=US; O=Amazon; CN=Amazon RSA 2048 M01
[2026-07-17T14:58:26.868Z] Name: api2.cursor.sh
[2026-07-17T14:58:26.868Z] AltName: DNS:api2.cursor.sh, DNS:prod.authentication.cursor.sh, DNS:*.api2.cursor.sh
[2026-07-17T14:58:26.868Z] DNS Time: 4ms
[2026-07-17T14:58:26.868Z] Connect Time: 154ms
[2026-07-17T14:58:26.868Z] TLS Time: 149ms
[2026-07-17T14:58:26.868Z] Result: true in 459ms

API: Success
Logs:
[2026-07-17T14:58:26.409Z] Start
[2026-07-17T14:58:27.537Z] Result: true

Ping: Success
Logs:
[2026-07-17T14:58:26.409Z] Sending ping 1
[2026-07-17T14:58:27.502Z] Response: ‘ping’ in 1093ms
[2026-07-17T14:58:27.503Z] Sending ping 2
[2026-07-17T14:58:27.589Z] Response: ‘ping’ in 86ms
[2026-07-17T14:58:27.589Z] Sending ping 3
[2026-07-17T14:58:27.757Z] Response: ‘ping’ in 168ms
[2026-07-17T14:58:27.757Z] Sending ping 4
[2026-07-17T14:58:27.843Z] Response: ‘ping’ in 86ms
[2026-07-17T14:58:27.843Z] Sending ping 5
[2026-07-17T14:58:27.938Z] Response: ‘ping’ in 95ms
[2026-07-17T14:58:27.938Z] Result: true

Chat: Success
Logs:
[2026-07-17T14:58:26.410Z] Starting stream
[2026-07-17T14:58:27.450Z] Response: ‘foo’ in 1040ms
[2026-07-17T14:58:28.479Z] Response: ‘foo’ in 1029ms
[2026-07-17T14:58:29.472Z] Response: ‘foo’ in 993ms
[2026-07-17T14:58:30.483Z] Response: ‘foo’ in 1011ms
[2026-07-17T14:58:31.461Z] Response: ‘foo’ in 978ms
[2026-07-17T14:58:32.454Z] Result: true

Agent: Success
Logs:
[2026-07-17T14:58:26.410Z] Starting stream
[2026-07-17T14:58:26.410Z] Pushing first message
[2026-07-17T14:58:27.734Z] Response: ‘foo’ in 1324ms
[2026-07-17T14:58:28.248Z] Pushing next message
[2026-07-17T14:58:28.338Z] Response: ‘foo’ in 604ms
[2026-07-17T14:58:28.838Z] Pushing next message
[2026-07-17T14:58:28.932Z] Response: ‘foo’ in 594ms
[2026-07-17T14:58:29.441Z] Pushing next message
[2026-07-17T14:58:29.535Z] Response: ‘foo’ in 603ms
[2026-07-17T14:58:30.043Z] Pushing next message
[2026-07-17T14:58:30.142Z] Response: ‘foo’ in 607ms
[2026-07-17T14:58:30.142Z] Result: true

Marketplace: Success
Logs:
[2026-07-17T14:58:26.406Z] Host: marketplace.cursorapi.com
[2026-07-17T14:58:26.617Z] Response in 211ms
[2026-07-17T14:58:26.617Z] Response: 200
[2026-07-17T14:58:26.617Z] Response Type: cors
[2026-07-17T14:58:26.617Z] Server: null
[2026-07-17T14:58:26.617Z] Result: OK in 211ms

Authentication: Success
Logs:
[2026-07-17T14:58:26.407Z] Host: prod.authentication.cursor.sh
[2026-07-17T14:58:27.126Z] Response: 200 in 719ms

Authentication UI: Success
Logs:
[2026-07-17T14:58:26.409Z] DNS lookup: authenticator.cursor.sh
[2026-07-17T14:58:26.629Z] Resolved authenticator.cursor.sh to 104.18.35.233 in 216ms

Cursor Tab: Success
Logs:
[2026-07-17T14:58:26.409Z] DNS lookup: api3.cursor.sh
[2026-07-17T14:58:26.421Z] Resolved api3.cursor.sh to 104.18.19.125 in 8ms

Agent Endpoint: Success
Logs:
[2026-07-17T14:58:26.409Z] DNS lookup: agent.api5.cursor.sh
[2026-07-17T14:58:26.629Z] Resolved agent.api5.cursor.sh to 100.30.166.181 in 215ms

Downloads: Success
Logs:
[2026-07-17T14:58:26.408Z] Host: downloads.cursor.com
[2026-07-17T14:58:27.182Z] Response: 403 in 774ms

CDN: Success
Logs:
[2026-07-17T14:58:26.408Z] Host: cursor-cdn.com
[2026-07-17T14:58:27.186Z] Response: 404 in 778ms

2

Hi there!

We detected that this may be a bug report, so we’ve moved your post to the Bug Reports category.

To help us investigate and fix this faster, could you edit your original post to include the details from the template below?

Bug Report Template - Click to expand

Where does the bug appear (feature/product)?

  • Editor, Tab & Chat (autocomplete, Composer, in-editor agent)
  • Terminal & commands
  • Models, pricing & API keys (availability, Auto/Max, BYOK/Bedrock)
  • MCP & tools
  • Cloud Agents & Automations (cursor.com/agents, scheduled/event)
  • BugBot & Code Review
  • Cursor CLI
  • Cursor Mobile
  • Remote (SSH / Dev Containers / WSL)
  • Account, billing & login
  • Something else…

Describe the Bug
A clear and concise description of what the bug is.

Steps to Reproduce
How can you reproduce this bug? We have a much better chance at fixing issues if we can reproduce them!

  1. …
  2. …
  3. …

Expected Behavior
What is meant to happen here that isn’t working correctly?

Screenshots / Screen Recordings
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Operating System

  • Windows 10/11
  • MacOS
  • Linux

Version Information

  • For Cursor IDE: Menu → About Cursor → Copy
  • For Cursor CLI: Run agent about in your terminal
IDE:
Version: 2.xx.x
VSCode Version: 1.105.1
Commit: ......

CLI:
CLI Version 2026.01.17-d239e66

For AI issues: which model did you use?
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For AI issues: add Request ID with privacy disabled
Request ID: f9a7046a-279b-47e5-ab48-6e8dc12daba1
For Background Agent issues, also post the ID: bc-…

Additional Information
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Does this stop you from using Cursor?

  • Yes - Cursor is unusable
  • Sometimes - I can sometimes use Cursor
  • No - Cursor works, but with this issue

The more details you provide, the easier it is for us to reproduce and fix the issue. Thanks!