Ubuntu VM 22.04 simple CLI command "freeze"

jazzspeed 25

Recently (I think about a month), all our Ubuntu VMs having strange behaviour.

The simple command like cat, ls, nano etc often 'frozen'.

When I run apt update, it usually ended up with "scanning ... " and this would also "frozen" (not able to see the process completed until the SSH connection disconnected - Broken pipe..).

Anyone have similar experience could kindly share what actually causing this please.

Thank you,

Vamsi Ram Annepu 200 Reputation points Microsoft Vendor

2025-02-28T07:24:01.73+00:00

Hi jazzspeed,
Thank you for reaching out to us on the Microsoft Q&A forum.
You can try to uninstall and reinstall your Azure CLI using the commands to try solving issue

Install the Azure CLI on Linux | Microsoft Learn

We would like to know more about your Ubuntu VMs configuration and if you are using any 3rd party app like puTTy for the connection or bash in Azure portal.
Feel free to reach us out with further queries.
jazzspeed 25 Reputation points

2025-02-28T08:52:41.8933333+00:00

Hi Vamsi,

Thank you for your suggestion.

FYI, I connect to my Azure Ubuntu VM via SSTP VPN + ssh command line from my notebook (not using putty or other 3rd party ssh client).

This has been great so far for the past around 2 years+.

Until started probably end of Jan 2025 (last month) I started having all simple Ubuntu CLI frozen.

I have currently managing 3 Ubuntu VMs: 2 PROD instances and 1 UAT.

All of them running on Ubuntu 22.04.

The UAT instance is quite recently created. And all of them are under Microsoft Cloud Defender.

And because of 'frozen' CLI I encounter lately, I did testing in UAT instance by removing the extension of MDE.Linux (which I thought it could be one of the reason).

But unfortunately it doesn't solve the issue.

Still all "cat", "nano", vi, ls etc would just freeze. I can't even see the content of small txt file using cat command.

And one more thing, I did test using sftp command to the vm.

"put" a file is no issue, but "get" a file is always stalled.

Thank you so much. I will take a look the link you shared and test that and share you the result.

Best regards,

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Ubuntu VM 22.04 simple CLI command "freeze"

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