Open ports question

[John45622]

Hi,

I am running the latest Cobia release and when I port-scan my server I get open ports for
111, 139, 445, 6000
139 is NetBIOS
445 is SMB (?)

but why are 111 and 6000 open?

I only run SMB and have no apps or containers installed.

Thanks!

 

[John45622]

TN doc doesn't mention them either

/solutions/optimizations/security/

 

[Patrick M. Hausen]

111 is Sun RPC, necessary among other things for NFS. Possibly they have the rpcd running whether NFS is actually used or not.

 

[John45622]

Ah right, thanks! Yeah, I have NFS turned off.

 

[John45622]

And I found this old thread on port 6000. Something to do with HA (which I also don't use). But the info is from 2019 on FreeNAS.
I don't route my storage so I can't block port 6000

Port 6000/tcp open X11 - it is intended? Any security problems due this?

Hello. Just scanned my FreeNAS and got the port 6000/tcp as open (X11). It is a security problem to have X11 accessible via network? If yes, how I can close it? Thanks in advanced.

www.truenas.com

 

[danb35]

It's the middleware listening on port 6000. You can confirm this with ss -tulpn, note the pid that's listening on port 6000, then ps aux | grep portnumber.