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ubuntu 14.04 - Cannot connect to Google Compute Engine instance via SSH in browser

I cannot connect to GCE via ssh. It is showing Connection Failed, and we are unable to connect VM on port 22.

And serial console output its shows

Jul 8 10:09:26 Instance sshd[10103]: error: Could not load host key: /etc/ssh/ssh_host_ed25519_key

Jul 8 10:09:27 Instance sshd[10103]: User username from 0.0.0.0 not allowed because not listed in AllowUsers

Jul 8 10:09:27 Instance sshd[10103]: input_userauth_request: invalid user username [preauth] Jul 8 10:09:27 Instance sshd[10103]: Connection closed by 0.0.0.0 [preauth] – Error Message

Yesterday it was working fine, but today it shows this error. I am new to GCE. Any suggestions?

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