Enable SSH remote root login on Debian/Ubuntu

[serveroffer]

Some Debian and Ubuntu based servers have disabled remote root login by default, if you need to enable it, you have update SSH config file.

Option one:
Switch privileges for root access:

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su - root

Update SSH config the file with one line:

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sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config

and restart SSH server

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service sshd restart

Now you should be able to connect using remote root.

Option two:
Switch privileges for root access:

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su - root

Open config file:

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nano /etc/ssh/sshd_config

search for line:
PermitRootLogin without-password
or
#PermitRootLogin without-password
Change line to:

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PermitRootLogin yes

Exit nano and restart SSH server

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service sshd restart