Connection failed error persists

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.