Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
i’ve problem in newer version 3.9.16 with connection trough proxy, seems the connection doesn’t goes trough anymore which result to error :
Cursor Network Diagnostic Results
FAILED (5): SSL, API, Ping, Chat, Agent
DNS: Success
Logs:
[2026-06-30T09:21:53.070Z] Host: api2.cursor.sh
[2026-06-30T09:21:53.070Z] Servers: 192.168.155.38,192.168.155.36
[2026-06-30T09:21:53.070Z] Resolved to 100.51.80.46 in 1ms
[2026-06-30T09:21:53.164Z] Resolved to 100.51.80.46 in 94ms
[2026-06-30T09:21:53.167Z] Resolved to 100.51.80.46 in 1ms
[2026-06-30T09:21:53.167Z] Resolved to 100.51.80.46 in 0ms
[2026-06-30T09:21:53.187Z] Host: api2.cursor.sh
[2026-06-30T09:21:53.187Z] Servers: system
[2026-06-30T09:21:53.187Z] Resolved to 34.197.247.23, 100.51.80.46, 34.198.42.18, 32.197.70.219, 23.20.96.163, 54.92.228.128, 54.236.191.220, 34.236.52.0 in 6ms
[2026-06-30T09:21:53.190Z] Resolved to 34.197.247.23, 100.51.80.46, 34.198.42.18, 32.197.70.219, 23.20.96.163, 54.92.228.128, 54.236.191.220, 34.236.52.0 in 0ms
[2026-06-30T09:21:53.191Z] Resolved to 34.197.247.23, 100.51.80.46, 34.198.42.18, 32.197.70.219, 23.20.96.163, 54.92.228.128, 54.236.191.220, 34.236.52.0 in 0ms
[2026-06-30T09:21:53.192Z] Resolved to 34.197.247.23, 100.51.80.46, 34.198.42.18, 32.197.70.219, 23.20.96.163, 54.92.228.128, 54.236.191.220, 34.236.52.0 in 0ms
[2026-06-30T09:21:53.192Z] Result: true
SSL: Error: read ECONNRESET
Logs:
[2026-06-30T09:21:53.047Z] Start
[2026-06-30T09:21:53.382Z] Error: read ECONNRESET in 335ms
API: Error: [aborted] read ECONNRESET
Logs:
[2026-06-30T09:21:53.049Z] Start
[2026-06-30T09:21:53.502Z] Error: ConnectError: [aborted] read ECONNRESET
Ping: Error: [aborted] read ECONNRESET
Logs:
[2026-06-30T09:21:53.049Z] Sending ping 1
[2026-06-30T09:21:53.502Z] Error: ConnectError: [aborted] read ECONNRESET
Chat: Error: [aborted] read ECONNRESET
Logs:
[2026-06-30T09:21:53.050Z] Starting streamSSE
[2026-06-30T09:21:53.501Z] Error: ConnectError: [aborted] read ECONNRESET
Agent: Error: [aborted] read ECONNRESET
Logs:
[2026-06-30T09:21:53.050Z] Starting stream
[2026-06-30T09:21:53.051Z] Pushing first message
[2026-06-30T09:21:53.500Z] Error: ConnectError: [aborted] read ECONNRESET
Steps to Reproduce
also i’ve tested on many clients and tried a few proxies with same result
Expected Behavior
it expected to connect via proxy and network test results successful
Operating System
Windows 10/11
Version Information
Version: 3.9.16 (user setup)
VS Code Extension API: 1.105.1
Commit: 042b3c1a4c53f2c3808067f519fbfc67b72cad80
Date: 2026-06-27T06:41:01.941Z
Layout: editor
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
Does this stop you from using Cursor
Yes - Cursor is unusable