Cursor Connection Error: Streaming Disconnect During AI Responses

What this error means

Cursor IDE: "Connection lost while receiving response" or stream disconnect error during AI code suggestions is a Cursor failure pattern reported for developers trying to fix cursor ide streaming disconnections causing incomplete code completions. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

OpenAI status page incident mc963m7c (resolved 2026-04-28): ‘Codex stream is disconnecting intermittently’. Cursor depends on Codex API; intermittent stream disconnects manifest as ‘connection lost’ errors in IDE. Component: Codex Web/Codex API. Connected to incident dcdq0m5b (April 24, gpt-5.5 in codex elevated errors). Strong Cursor-specific error pattern with clear fix demand.

Common causes

• OpenAI status page incident mc963m7c (resolved 2026-04-28): ‘Codex stream is disconnecting intermittently’. Cursor depends on Codex API; intermittent stream disconnects manifest as ‘connection lost’ errors in IDE. Component: Codex Web/Codex API. Connected to incident dcdq0m5b (April 24, gpt-5.5 in codex elevated errors). Strong Cursor-specific error pattern with clear fix demand.

Quick fixes

1. Confirm the exact error signature matches Cursor IDE: "Connection lost while receiving response" or stream disconnect error during AI code suggestions.
2. Check the Cursor account, local tool state, and provider configuration involved in the failing workflow.
3. Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://status.openai.com/incidents/mc963m7c
• https://status.openai.com/incidents/dcdq0m5b

Evidence note: OpenAI status page incident mc963m7c (resolved 2026-04-28): ‘Codex stream is disconnecting intermittently’. Cursor depends on Codex API; intermittent stream disconnects manifest as ‘connection lost’ errors in IDE. Component: Codex Web/Codex API. Connected to incident dcdq0m5b (April 24, gpt-5.5 in codex elevated errors). Strong Cursor-specific error pattern with clear fix demand.

Related errors

• Cursor

FAQ

What should I check first?

Start with the exact Cursor IDE: "Connection lost while receiving response" or stream disconnect error during AI code suggestions text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed Cursor workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without Cursor IDE: "Connection lost while receiving response" or stream disconnect error during AI code suggestions.