Hey Guys, on one of our tenats we can't connect to the serial console on Windows VM, with Linux no issues at all. we getting the following error: The serial console connection to the VM encountered an error: 'ERR_BAD_RESPONSE' (504) - Request failed with status code 504

Hello Yusuf Oezeren Welcome to Microsoft Q&A Platform, thanks for posting your query here. The error message "ERR_BAD_RESPONSE" indicates that the Serial Console feature is not able to establish a connection with the VM. Please try these troubleshooting steps to see if it helps resolve the issue: -Check the configuration of the VM and make sure that the Serial Console feature is enabled. -Try to restart the VM and see if that helps. -Try to stop and start the VM, once the VM is started this will be moved to new host. Hope this helps.

Azure Windows VM Serial Console ERROR 504

Yusuf Oezeren 30

Hey Guys,

on one of our tenats we can't connect to the serial console on Windows VM, with Linux no issues at all.

we getting the following error:

azurevm

The serial console connection to the VM encountered an error: 'ERR_BAD_RESPONSE'

(504) - Request failed with status code 504

$000 Adam Felner 0 Reputation points

2024-05-23T14:27:03.9333333+00:00

Hello All,

Having same issue here on Windows/Linux VMs within several regions and SKUs from v3 to v5.

Deployment of VMs through TF where boot diagnostic storage is specified as null ( using MS provided- serial log and boot diagnostic works as expected), however the issue preserves. Already have tried several redeployments, several restart and still having same issue. Found some old articles about this being issue on SKU v5, however I can see it on v3 or v4 as well in multiple regions.

Thanks
vipullag-MSFT 26,021 Reputation points

2024-05-28T04:27:06.2166667+00:00

Hello Yusuf Oezeren

Any update on the issue?

Just checking in to see if you got a chance to see previous response.

If the suggested response helped you resolve your issue, please 'Accept as answer', so that it can help others in the community looking for help on similar topics.
vipullag-MSFT 26,021 Reputation points

2024-05-28T04:28:45.82+00:00

Hello $000 Adam Felner

This issue needs deeper investigation. Support team will be able to check and help on this. I would recommend you to open a azure support case.
Imran Khan 21 Reputation points

2024-05-28T07:48:33.9866667+00:00

The issue seems to be effecting multiple environments. Seems like this might be a global issue with MS. I have tested with multiple VM in multiple regions and still seeing the same issue.

Do we have a fix for this?

1 answer

vipullag-MSFT 26,021 Reputation points

2024-05-23T09:51:48.01+00:00

Hello Yusuf Oezeren

Welcome to Microsoft Q&A Platform, thanks for posting your query here.

The error message "ERR_BAD_RESPONSE" indicates that the Serial Console feature is not able to establish a connection with the VM.

Please try these troubleshooting steps to see if it helps resolve the issue:

-Check the configuration of the VM and make sure that the Serial Console feature is enabled.

-Try to restart the VM and see if that helps.

-Try to stop and start the VM, once the VM is started this will be moved to new host.

Hope this helps.
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Azure Windows VM Serial Console ERROR 504

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