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I'm currently using openSSH and my admin user configured without login password, i.e automatically logging in during startup. I wonder what happens in such case, is there an automatic default password for SSH connectivity?

I've another related question, during installation I chose "Run as LOCAL_SYSTEM" what does it mean?

C:\WINDOWS\system32>ssh -V
OpenSSH_7.4p1, OpenSSL 1.0.2j  26 Sep 2016
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    Mar 21, 2017 at 11:38

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By default OpenSSH does not allow empty passwords, as you can read in manual page for sshd_config.

PermitEmptyPasswords

When password authentication is allowed, it specifies whether the server allows login to accounts with empty password strings. The default is no.

This is reasonable for remote login. Unless you change this option, or set a password for your user, you should not be able to use SSH to log in to your system.

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Instead of using password, you may consider using Public Key. Leaving the passphrase blank when generating the key pair allows you to log in using public key without typing password.

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