Endless "connection error messages" that cannot be resolved.

[Majofski]

This is the message: Connection failed. If the problem persists, please check your internet connection or VPN Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools [internal] (Request ID: 67d1bf23-380c-4cad-abd9-9e748049c888)

This is a known problem, I found many references to it. But apparently Cursor cannot solve it. I am going to cancel. WHAT SHIT THIS IS. It is not even possible to restart Cursor without rebooting.

[sahilk0267]

Yeh i'm suffering same issue..! Even i have tried using old version of IDE, which is working super slow output (it has taken 1hrs for writing a code of 500 lines 4 files) with a free plan but in same version could not able to write a single file. It is totally malfunctioning network issue..! May be the main issue is with ip and dsn..!

[Pasajeromoronmoreno]

Same shit.

[GuguguBear]

Connection failed. If the problem persists, please check your internet connection or VPN Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools [internal] (Request ID: df3e1ef0-29fd-4135-ab14-3f334b10e92b)

[risingglory]

Same issue here, any information on this?

[obabac]

Connection failed. If the problem persists, please check your internet connection or VPN Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools [internal] (Request ID: 2d1a9a52-750f-4632-9b08-b4d50b29b714)

Request ID: 051a9ce0-2e15-48f6-a8ed-34e94ee5ce3c ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/c:/Users/onurh/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7349:369901

Request ID: 685e73e7-8190-410a-b133-4133480616b9 ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/c:/Users/onurh/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7349:369901

I get this error on regular basis. Would be nice if we could fix it

[charlieelcarlino]

Please Cursor fix this, it's been impossible to use it for two weeks.

[healthypaws]

Hi everyone,

It’s concerning to see that this issue has been open for several months with no clear resolution or public update. Multiple paying users are affected, and this error completely breaks the core Chat and Agent functionality of Cursor.

At this point, it would be fair to expect an official statement or progress update from the engineering team — even if it’s just an ETA, a root cause summary, or confirmation that a hotfix is in progress.

It’s hard to justify continuing to rely on Cursor professionally when critical bugs stay unresolved for months. We all understand that beta features can have issues, but this one affects the main product experience, not just experimental tools.

Please provide a concrete status update, or escalate this internally as a priority production issue.

[Behzad-madjidi]

Connection failed. If the problem persists, please check your internet connection or VPN Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools [internal]

[R0binT]

same here

[kaser2010]

same

[darren277]

Ditto.

[klyakh]

Started receiving this error today.

Version: 1.7.52 (system setup) VSCode Version: 1.99.3 Commit: 9675251a06b1314d50ff34b0cbe5109b78f848c0 Date: 2025-10-17T01:41:03.967Z Electron: 34.5.8 Chromium: 132.0.6834.210 Node.js: 20.19.1 V8: 13.2.152.41-electron.0 OS: Windows_NT x64 10.0.19045

Request info: Request ID: bb38f030-c774-4448-942a-789741daede2 ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/d:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7337:373208

[MuhammadSulman-Ora]

Same here > Request ID: 16c8e41b-812a-411b-b167-113d4e2902fd ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/c:/Users/..../AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7337:373472

[Mulo-freepal]

Request ID: 2fe1e823-e336-43a5-8523-7ac28eb325b5 ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7347:369901

[Tynoxval]

same here

[kdemir-c7]

same here, it happens always on "dotnet run" execution Request ID: 1f19df11-67bd-4b0e-a1c8-ec1aed8186fa ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7337:373472

[dangkhoa1102]

Same problem here: Request ID: 802086bf-50fe-4410-be18-86d1d977d4ce ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7349:369901

[Jdcorley]

Getting same issue when running 'npm install'

[RupertH0lland]

Request ID: 0ba48be6-9a90-4af2-96b7-98b262c53f48 ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7337:373472 Same here

[accondisapp]

Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools [internal]

[badreldenbeko]

same for me please fix Request ID: 5e9f6b8e-d4f1-4f9c-acae-82dc0472f706 ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/c:/Users/badre/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7337:373472

[johnnyshields]

Same for me. It seems to be something to do with the state of the chat, i.e. certain outputs, esp. terminal commands, failing to run tests seem to trigger it. as a workaround if I go to a point earlier in the chat or start a new chat it works fine.

Connection failed. If the problem persists, please check your internet connection or VPN
Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools [internal]
(Request ID: 00c0ff6f-a525-4d0e-a2dc-1698ad9ecd1a)

(For clarity it is not related to my internet connection itself--otherwise how would I be sending this message? 🤣 )

[sewakcctv]

Same issue and sometimes its very persistent. I agree with @johnnyshields It seems to be something to do with the state of the chat, i.e. certain outputs, esp. terminal commands, failing to run tests seem to trigger it. as a workaround if I go to a point earlier in the chat or start a new chat it works fine.

Request ID: 509fd6bb-7db6-420a-a0ce-d61141530855 ConnectError: [internal] Serialization error in aiserver.v1.StreamUnifiedChatRequestWithTools at vscode-file://vscode-app/c:/Program%20Files/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7349:396794

[pay4ok-exe]

same issue

[jaehyun2yo]

same issue

[ColumKellyHomeMove]

Same issue.

[GuguguBear]

Request ID: 270c68ca-ca1a-4e50-8b76-65c8a727ec3d
{"error":"ERROR_BAD_REQUEST","details":{"title":"Bad request.","detail":"Bad Request","isRetryable":false,"additionalInfo":{},"buttons":[],"planChoices":[]},"isExpected":true}
ConnectError: [invalid_argument] Error
    at t7l.$endAiConnectTransportReportError (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7337:375292)
    at TMr._doInvokeHandler (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:489:35946)
    at TMr._invokeHandler (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:489:35688)
    at TMr._receiveRequest (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:489:34453)
    at TMr._receiveOneMessage (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:489:33275)
    at cEt.value (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:489:31369)
    at _e._deliver (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)
    at _e.fire (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)
    at cdt.fire (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7322:12154)
    at MessagePort.<anonymous> (vscode-file://vscode-app/c:/Users/xxx/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:9402:18292)

Many times, projects fail just like this and people lose patience.

[GuguguBear]

Almost every 1-2 days, I definitely encounter 1-3 instances of this issue. I hope it can be resolved, otherwise things cannot progress effectively.

[Marijn17s]

same issue here

[po3030888-cyber]

same issue here