ERROR: (gcloud.compute.ssh) [/usr/bin/ssh] exited with return code [255] -

ERROR: (gcloud.compute.ssh) [/usr/bin/ssh] exited with return code [255] -

kept getting kicked out of compute engine instance after few seconds of idle indicated error (255). used 'gcloud compute ssh' log in. using default firewall setting, believe plenty ssh. if missing something, please indicate , suggest prepare error. can't efficient work done @ point having ssh in many times.

thanks in advance.

anh-

error stating default firewall allow connections instance. contrary turned out true. please refer an appropriate firewall rule must set allow connection instance

anh-

ssh gcloud