I can't connect to my VM instance. "default-allow-ssh" rule in Firewall is "Allow". I think maybe logs help:
Aug 30 09:23:24 my-vm google-accounts: ERROR Exception calling the response handler. [Errno 2] No usable temporary directory found in ['/tmp', '/var/tmp', '/usr/tmp', '/'].#012Traceback (most recent call last):#012 File "/usr/lib/python3/dist-packages/google_compute_engine/metadata_watcher.py", line 200, in WatchMetadata#012 handler(response)#012 File "/usr/lib/python3/dist-packages/google_compute_engine/accounts/accounts_daemon.py", line 285, in HandleAccounts#012 self.utils.SetConfiguredUsers(desired_users.keys())#012 File "/usr/lib/python3/dist-packages/google_compute_engine/accounts/accounts_utils.py", line 318, in SetConfiguredUsers#012 mode='w', prefix=prefix, delete=True) as updated_users:#012 File "/usr/lib/python3.6/tempfile.py", line 681, in NamedTemporaryFile#012 prefix, suffix, dir, output_type = _sanitize_params(prefix, suffix, dir)#012 File "/usr/lib/python3.6/tempfile.py", line 269, in _sanitize_params#012 dir = gettempdir()#012 File "/usr/lib/python3.6/tempfile.py", line 437, in gettempdir#012 tempdir = _get_default_tempdir()#012 File "/usr/lib/python3.6/tempfile.py", line 372, in _get_default_tempdir#012 dirlist)#012FileNotFoundError: [Errno 2] No usable temporary directory found in ['/tmp', '/var/tmp', '/usr/tmp', '/']
Aug 30 09:23:30 my-vm systemd[1]: snapd.service: State 'stop-sigterm' timed out. Killing.
Aug 30 09:23:30 my-vm systemd[1]: snapd.service: Killing process 15472 (snapd) with signal SIGKILL.
Aug 30 09:23:30 my-vm systemd[1]: snapd.service: Main process exited, code=killed, status=9/KILL
Aug 30 09:23:30 my-vm systemd[1]: snapd.service: Failed with result 'timeout'.
Aug 30 09:23:30 my-vm systemd[1]: Failed to start Snap Daemon.
Aug 30 09:23:31 my-vm systemd[1]: snapd.service: Service hold-off time over, scheduling restart.
Aug 30 09:23:31 my-vm systemd[1]: snapd.service: Scheduled restart job, restart counter is at 939.
Aug 30 09:23:31 my-vm systemd[1]: Stopped Snap Daemon.
Aug 30 09:23:31 my-vm systemd[1]: Starting Snap Daemon...
Aug 30 09:23:31 my-vm snapd[15582]: AppArmor status: apparmor is enabled and all features are available
Aug 30 09:23:31 my-vm snapd[15582]: AppArmor status: apparmor is enabled and all features are available
Mostly this is happen because your disk storage is full. If you have other type of access to your VM like connect using Serial console, check your disk space allocated status through it and try to free up some space or add additional data storage if its full.