SSH key authentication suddenly getting timedout on GCP even Connection via Cloud Identity-Aware Proxy Failed

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Earlier I was able to connect using ssh ubuntu@host but suddenly ssh stopped working. Even i restarted the machine. Tried to connect using browser ssh and still got the error. and I follow instructios mentioned here with no luck.


ssh: connect to host port 22: Operation timed out

Connection via Cloud Identity-Aware Proxy Failed
Code: 4003
Reason: failed to connect to backend

Connection to VM is refused.
Please ensure that:
- VM has a firewall rule that allows TCP ingress traffic from the IP range, port: 22
- SSH daemon on target VM is up and running

You may be able to connect without using the Cloud Identity-Aware Proxy.

Can anybody help with the right direction? Thanks

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