Buffered by a proxy problem

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

IDE Latest Version，Using the company’s intranet Sydney exit
using the Tailscale service, and it displays: Result: Error: HTTP/1.1 SSE responses are being buffered by a proxy in your network environment.

Steps to Reproduce

Use Tailscale VPN,
Set a exit node at Sydney.

Expected Behavior

Can be access.

Screenshots / Screen Recordings

4801765556435_.pic.jpg
4801765556435_.pic.jpg1256×3153 366 KB

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.2.20 (Universal)
VSCode Version: 1.105.1
Commit: b3573281c4775bfc6bba466bf6563d3d498d1070
Date: 2025-12-12T06:29:26.017Z (9 hrs ago)
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 24.6.0

For AI issues: which model did you use?

Sonnet 4.5

Does this stop you from using Cursor

Yes - Cursor is unusable

Network Error. The network freezes after several requests
3

Hey, thanks for the report.

It looks like Tailscale is buffering Server-Sent Events (SSE), which breaks streaming responses from Cursor.

Could you try:

  1. Turning off your VPN and checking if Cursor works directly
  2. Trying a different VPN location
  3. Running Network Diagnostics: Cursor Settings > Network > Run Diagnostics

Also, please share:

  • Does Cursor work without Tailscale?
  • The Network Diagnostics results
  • Whether you can use a different Tailscale configuration

This will help us determine if the issue is related to Tailscale.

4

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