Azure: stream disconnected before completion: response.failed event received

What version of Codex is running?

codex-cli 0.91.0

What subscription do you have?

Azure (Visual Studio Enterprise)

Which model were you using?

gpt-5.2-codex

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What terminal emulator and version are you using (if applicable)?

Windows Terminal 1.23.13503.0

What issue are you seeing?

Codex runs for a while, then gives me the error:

stream disconnected before completion: response.failed event received

What steps can reproduce the bug?

Sadly no clear str, but it often happens in /review or long-running loops with high reasoning effort.

Uploaded thread: 019bfc27-dd66-7431-96e3-881df4751b68

What is the expected behavior?

Stream completes normally.

Additional information

No response

@etraut-openai

CC @etraut-openai.

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

Powered by Codex Action

This looks like it's an issue that we fixed (or at least mitigated) a couple of weeks ago. Under certain circumstances, the latest models are taking a long time to stream responses, and this can trigger a timeout at the HTTP layer. The fix was to introduce a keepalive on the server side. It's quite possible that the Azure team has not yet integrated this change on their side. You might want to report the issue to them.

Under certain circumstances, the latest models are taking a long time to stream responses, and this can trigger a timeout at the HTTP layer.

In the meantime, could the tiemout (on the Codex CLI side) be made configurable, or is it already?

A client-side fix isn't possible for this. It need to be fixed on the server.

Still facing this issue with gpt-5.3-codex on Azure

@matys1

@matys1, make sure you're reporting these issues to Azure as well. If it's a connectivity issue on their side, they won't know that you're facing issues if you report it here.

Still getting this and I am using gpt-5.1-codex-mini high. this is frustrating. These issues dont happen on claude code. so to come here and experience it, really defeats the purpose of using codex at all

Most of these the "disconnected before completion" issues turn out to be network connectivity issues — often related to VPNs, proxies, and firewalls. We receive a lot of these bug reports and don't have time to investigate them all. We are working on a connectivity analyzer tool to help users self-diagnose these issues.

As I mentioned above, if you have not already done so, I recommend reporting these issues to Azure as well. If this is a connectivity issue on their side, they will not know about it if you don't report it to them.

@etraut-openai

Still facing this issue with gpt-5.3-codex on Azure

same here with xhigh - @etraut-openai where do we report this to Azure?

I was running into this issue and resolved it by increasing the capacity on the Azure deployed model (e.g. 300).

I was running into this issue and resolved it by increasing the capacity on the Azure deployed model (e.g. 300).

This worked for us, thanks!

I kept running into this on Azure with gpt-5.3-codex and 5.4. Built a workaround that auto-retries on stream disconnect and splits large tasks into separate sessions to avoid context overflow and compaction errors.
https://github.com/pauldinu10/codex-smart
It's a PowerShell wrapper that runs each task from a tasks.md file as a fresh codex exec --full-auto session. If the stream drops, it retries automatically up to N times. Not a fix, but makes Codex usable for long migrations.

same here with 5.5 - super annoying!

Hey all, are you still having the issues using azure ai foundry through codex ? If yes I managed to fix the issue (I think). I was experiencing the issue everyday and then I thought about a parameter in azure AI foundry.
When you create a deployment (basically deploy gpt 5.4 or 5.5 model in Azure AI Foundry), you can control the token per minute rate and by default it is set to 250k. I increased it to a million token per minute and it solved the issue.
I think the issue was that once codex reach the limit, it get rate alerte from azure ai foundry which leads to the reconnecting.

Hey all, are you still having the issues using azure ai foundry through codex ? If yes I managed to fix the issue (I think). I was experiencing the issue everyday and then I thought about a parameter in azure AI foundry. When you create a deployment (basically deploy gpt 5.4 or 5.5 model in Azure AI Foundry), you can control the token per minute rate and by default it is set to 250k. I increased it to a million token per minute and it solved the issue. I think the issue was that once codex reach the limit, it get rate alerte from azure ai foundry which leads to the reconnecting.

Which account are you in? I can't do that...

Hey all, are you still having the issues using azure ai foundry through codex ? If yes I managed to fix the issue (I think). I was experiencing the issue everyday and then I thought about a parameter in azure AI foundry. When you create a deployment (basically deploy gpt 5.4 or 5.5 model in Azure AI Foundry), you can control the token per minute rate and by default it is set to 250k. I increased it to a million token per minute and it solved the issue. I think the issue was that once codex reach the limit, it get rate alerte from azure ai foundry which leads to the reconnecting.

It works, thanks!

Changing the token limit from 250k to 1 million solved the issue for me as well. Previously at 250k token limit, I would get the error: "■ stream disconnected before completion: response.failed event received." Following my change to 1 million, it did not happen again.

Using gpt 5.6, still having this issue, on one of the VM it works fine, on the other it does not

@VABVAT

what vm it doesnt have this @VABVAT ?

@KENILSHAHH

@KENILSHAHH on jupyter notebook hosted on AWS (sagemaker)

having the same issue

This is a constant issue for us as well through a HTTP Proxy -> hitting the Azure Foundry deployed endpoint. 5.6-sol and other models

Navigation Menu

Repository navigation

Azure: stream disconnected before completion: response.failed event received #9936

What version of Codex is running?

What subscription do you have?

Which model were you using?

What platform is your computer?

What terminal emulator and version are you using (if applicable)?

What issue are you seeing?

What steps can reproduce the bug?

What is the expected behavior?

Additional information

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Azure: stream disconnected before completion: response.failed event received #9936

Description

What version of Codex is running?

What subscription do you have?

Which model were you using?

What platform is your computer?

What terminal emulator and version are you using (if applicable)?

What issue are you seeing?

What steps can reproduce the bug?

What is the expected behavior?

Additional information

Activity

codeofdusk commented on Jan 26, 2026

github-actions commented on Jan 26, 2026

etraut-openai commented on Jan 26, 2026

codeofdusk commented on Jan 26, 2026

etraut-openai commented on Jan 27, 2026

matys1 commented on Mar 5, 2026

etraut-openai commented on Mar 5, 2026

sgil-itglue commented on Mar 5, 2026

etraut-openai commented on Mar 5, 2026

mbartonftp commented on Mar 5, 2026

drew-simmons commented on Mar 11, 2026

mbartonftp commented on Mar 12, 2026

pauldinu10 commented on Mar 23, 2026

Hundsmuhlen commented on May 5, 2026

OrhanYaz commented on May 6, 2026

6639835 commented on May 6, 2026

6639835 commented on May 6, 2026

jo-rum commented on Jun 17, 2026

VABVAT commented on Jul 20, 2026

KENILSHAHH commented on Jul 24, 2026

VABVAT commented on Jul 24, 2026

Alvi24 commented on Jul 31, 2026

markojak commented on Aug 4, 2026

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions