Connection error in Cursor when on Ukrainian IP

[Denis9999 (Denis)]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Since last week the chat in the Cursor IDE always gives me Connection error:

Request ID: b98b2bda-1ce1-4868-91ad-d2c66300369d
ConnectError: [internal] 4277788264640:error:10000410:SSL routines:OPENSSL_internal:SSLV3_ALERT_HANDSHAKE_FAILURE:../../third_party/boringssl/src/ssl/tls_record.cc:486:SSL alert number 40

at UZc.$streamAiConnect (vscode-file://vscode-app/tmp/.mount_cursor6LiNq3/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:6331:406060)
at async vscode-file://vscode-app/tmp/.mount_cursor6LiNq3/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:565:75277
at async Object.run (vscode-file://vscode-app/tmp/.mount_cursor6LiNq3/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:6399:42465)
at async o (vscode-file://vscode-app/tmp/.mount_cursor6LiNq3/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:2815:1269)
at async Promise.allSettled (index 0)
at async o7r.run (vscode-file://vscode-app/tmp/.mount_cursor6LiNq3/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:2815:6513)

I’m in Ukraine. And I get the same error if I try to connect using VPN with Ukrainian IP (so it’s not an issue related to my internet provider).
And if I use VPN with, say, German or American IP, everything works fine.

Steps to Reproduce

Connect using Ukrainian IP.

Expected Behavior

I should be able to use Cursor without VPN connections (and it worked fine until last week).

Screenshots / Screen Recordings

Operating System

Linux

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.1.39
VSCode Version: 1.105.1
Commit: 60d42bed27e5775c43ec0428d8c653c49e58e260
Date: 2025-11-27T02:30:49.286Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Linux x64 6.8.0-87-generic

Does this stop you from using Cursor

No - Cursor works, but with this issue

[deanrie]

Hey, thanks for the report.

Quick workaround to try:

• App Settings Ctrl+, → search “HTTP/2” → enable “Disable HTTP/2” → restart Cursor → test chat again.

If it still fails, please share:

• Settings → Network → Run Diagnostics (screenshot)
• Your ISP and whether you’re using any firewall/proxy (e.g., Zscaler)

Reference: another user hit the same SSL alert and disabling HTTP/2 fixed it: SSLV3_ALERT_HANDSHAKE_FAILURE when creating new chat

Let me know if the HTTP/2 toggle helps.

[Denis9999 (Denis)]

Disabling HTTP/2 helped.
Thanks a lot!

[taraslev (T Lev)]

Hi, I’m sorry but is there a way to enable http2 in cursor? with http1 it feels like much worse and slower experience.
It stopped working for me for about a week already and for my friends from Ukraine as well?

[Max_Donchenko]

I second this ^

composer-1 was lightning fast for me all the time, and now with HTTP1 (which is the only option) it’s working significantly slower.

[rogrammer]

Same issue and reverting to HTTP/1.1 doesn’t work

[Max_Donchenko]

The issue is now gone (v2.2.20)

[Max_Donchenko]

Thanks for resolving it Cursor team!

[Max_Donchenko]

Sorry for writing back and forth - the issue now happens again. It works with http1 and stops working with http2.

Reinstalling Cursor also didn’t help.