open port question

I'm setting up a linux box that is basically living out there on the Internet. It's sitting at a very minimum install right now, and I'm trying to figure out if it's safe to just leave running until I've had more time to study up more on securing it.

I just ran netstat -an which returned the following:
Code: 
root@us:~# netstat -an
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 :::22                   :::*                    LISTEN
tcp        0    200 ::ffff:<SNIPBOXIP>:22  ::ffff:<SNIPMYIP>:2650 ESTABLISHED
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node Path
unix  3      [ ]         DGRAM                    498    /dev/log
unix  2      [ ]         DGRAM                    501
root@us:~#
The way I understand it is this box is only listening to connections on port 22 which is ssh. Is that correct?

Is there any harm in leaving the box up like this, only accepting SSH connections?

What about those UNIX domain sockets? I think I read that those can only be accessed locally. Are they safe, or do I need to look into trying to do something to secure them?

Thanks.

 

 

 

 

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