Connection failed error persists

Support Bug Reports
1

I haven’t been able to use Cursor since morning.

Every time when I’m trying to ask something in “Ask” or “Agent” mode I get the following error:

Connection failed. If the problem persists, please check your internet connection or VPN

(Request ID: 3ee5fa2d-71a2-40c4-b7d4-c3f736271f41)

What I tried so far:

  • rebooting my computer
  • reinstalling latest version of Cursor
  • installing not the latest version of Cursor (0.48)
  • switching to paid subscription (although I still had some requests left in a free trial)
  • choosing custom models instead of “auto” model
  • switching on and off my corporate VPN

Nothing seems to work. Please help with the issue.

1 Like
2

To clarify, I’m on Windows. Here’s how the error looks like

cursor-error
cursor-error355×1365 18.4 KB

1 Like
3

That’s what I see in the Developer Tools.

dev-tools
dev-tools2559×1400 220 KB

4

Any idea how to deal with it?

error
error2557×1381 204 KB

5

Do you have any IPv6 address on the interface? try disable ipv6.

6

I tried disabling ipv6 but it didn’t work.

Nevertheless, I found a working solution.

So I installed Cursor on my personal Mac (previously Cursor has been only on the corporate Windows computer), ran it and asked Cursor itself what’s wrong with them.

Here’s what it replied:

“Based on my research of common Cursor connectivity issues, here are the main reasons why Cursor might work on your Mac but not on Windows, along with potential solutions:
HTTP/2 Protocol Issues
Some corporate networks, VPNs, or proxies block HTTP/2 which Cursor uses by default
Solution: Try disabling HTTP/2 in Cursor settings:
Open Cursor settings (Ctrl/Cmd + ,)
Search for “http2”
Enable the setting “cursor.general.disableHttp2”: true”

7

Long story short, try this:

Open Cursor settings (Ctrl/Cmd + ,)
Search for “http2”
Enable the setting “cursor.general.disableHttp2”: true”

It worked for me.

1 Like
8

I think chat only works with http2 on newer versions.

9

disable http/2 bring the chat back, but I experience index failure issue and in my output I get self-signed certificate in certificate chain, handshake failed error all the time, and the agent basically doesn’t work…

10

Sorry, I don’t know how to help with the rest of your issues. Maybe try removing all the cache and reinstalling Cursor - that’s what I did (multiple times in different variations) before coming to the solution with http2.

11

This has been happening much more frequently for me in the past week. I have already had http2 disabled for a couple of weeks. It seems it happens when a single chat gets too long much faster now.

12

happening 100x a day

1 Like
13

I had a similar problem. Restarted Cursor, fiddled with HTTP2, Logged out of Cursor, logged back in. Updated Windows, rebooted.

Nothing worked.

And when I did “New Window” everything was fine.

14

Same issue: 3a108be7-230e-431a-a5d5-4b3e2706f568
I played with http2, restarted pc. This seems to happen after 25 calls and I have to resume the conversation. Please fix ASAP!

15

This has been my experience as well.

16

This does not work for me. I now circle around and arround to login. I’m on a MAC, I just downloaded and am trying to use the software.

17

a82143ed-d0a5-4ff8-be5e-62893f0a66ad

18

getting impossible to use Cursor.. have started to consider switch back to vscode..

19

I agree… also they don’t fix the problems and won’t reply to request that they can’t be bothered to fix. I guess attracting more easy user is easier than fixing robustness problems for pro users.

21

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.