An unexpected error occurred on our servers ,Session error

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

An unexpected error occurred on our servers. Please try again, or contact support if the issue persists.
Request ID: d0c5edf4-4c98-4a90-9d00-c6b961cfa8e5
[unknown] Network disconnected
l6e: [unknown] Network disconnected
at Fpk (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:35852:26781)
at NDw (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:35852:25580)
at Gpk (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:35853:6852)
at hmf.run (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:35853:11731)
at async qZs.runAgentLoop (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:48220:22008)
at async OKf.streamFromAgentBackend (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:48288:12345)
at async OKf.getAgentStreamResponse (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:48288:19576)
at async Vyn.submitChatMaybeAbortCurrent (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:35985:17397)
at async zh (vscode-file://vscode-app/d:/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:47271:3889)

Steps to Reproduce

1.Open Cursor IDE.
2.Create a new Agent or Ask chat.
3.Type any prompt, including simple prompts like “hey”.
Cursor starts:
4.“Planning next moves”
5.Then changes to:
.“Taking longer than expected…”
6.Then changes to:
“Reconnecting…”
7.Eventually shows:
“Internal Error — An unexpected error occurred on our servers.”

Expected Behavior

Agent/Ask chat should respond normally to prompts instead

Screenshots / Screen Recordings

ScreenShot_2026-05-28_162121_914.png
ScreenShot_2026-05-28_162121_914.png1186Ă—1242 35.3 KB

Operating System

Windows 10/11

Version Information

Cursor IDE latest stable version.
Issue persists after restart and reboot.

For AI issues: which model did you use?

Auto mode
GPT-5.5

For AI issues: add Request ID with privacy disabled

d0c5edf4-4c98-4a90-9d00-c6b961cfa8e5

Additional Information

Environmental monitoring anomaly detected; it was normal 3 hours ago.

Does this stop you from using Cursor

Yes - Cursor is unusable

5

Hey, from the diagnostics screenshot it looks like HTTP/2 is failing with “Unexpected protocol: undefined”. Because of that, API, Ping, Chat, and Agent are marked as unavailable. DNS, Auth, and CDN are passing, so your network can reach Cursor in general, but the HTTP/2 stream is getting blocked. This is common with corporate proxies, VPNs, antivirus software, or an unstable outbound connection.

Try this workaround:

  1. Open app settings with Ctrl+,
  2. Search for HTTP/2
  3. Switch the option to HTTP/1.1
  4. Restart Cursor and run Run Diagnostics again

If API, Chat, and Agent turn green after that, the issue was the HTTP/2 stream going through your network or proxy.

If it stays the same, check this:

  • Make sure VPN, proxy, or a corporate firewall is disabled. Zscaler and similar tools often break HTTP/2 specifically
  • Try another network, like a mobile hotspot. If it works there, it’s definitely your current network

Let me know what the diagnostics show after disabling HTTP/2.

6

The issue has been resolved—it was caused by an outdated Cursor version. When testing on a new computer with the latest version of Cursor, the problem was perfectly fixed.

However, I’d like to offer some feedback: Why aren’t version updates automatically pushed? This issue took five hours to resolve, wasting valuable production time.

7

Glad we got it sorted out, and thanks for the update on the issue.

About updates, they arrive automatically, but via a staged rollout, so the rollout happens in waves and can take 1 to 3 days after release. Also on Windows, the update downloads in the background but only applies the next time you restart Cursor, so if the app hasn’t been closed for a while, the new version won’t show up. Sometimes auto-update can quietly fail due to permissions, antivirus software, or corporate network restrictions.

To check manually: Help > Check for Updates (or Ctrl+Shift+P > Attempt Update). You can see your current version in Help > About. If the update gets stuck, you can download the installer directly from Cursor · Download.

I’ll pass along your feedback about making new version notifications more obvious to the team.