Suddenly unable to connect to Google Cloud VM

[tranhuy]

My Linux virtual machine is working normally but suddenly cannot login, the error message “authentication failed, please try again.”
When I try to connect SSH to VM via cloud console, I got this error:

Connection via Cloud Identity-Aware Proxy Failed
Code: 4003
Reason: failed to connect to backend
You may be able to connect without using the Cloud Identity-Aware Proxy.

[Carin]

Hi tranhuy,

It doesn’t look like the problem is related to NoMachine.

Please check your security/firewall settings.

[Author]

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