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Old 12-03-2003, 08:06 AM   #1
djcomplex
LQ Newbie
 
Registered: Oct 2002
Distribution: Mandrake 9.x
Posts: 18

Rep: Reputation: 0
Ports


Hey folks, im trying to secure my server as much as possible

when i nmap i get
Port State service
25/tcp open smtp
80/tcp open http
443/tcp open https
3306/tcp filtered mysql
6000/tcp open X11
10000/tcp open snet-sensor-mgmt


now this box needs to serve a webpage and send mail (mailing list) to my smtp server, so does port 25 need to be open as the mail is just being sent not recieved? Also im not sure what the filtered state means on the mysql service? would someone be able to tell me what it is? i know that port 10000 is open for webmin as ive been using it to config things ill turn it off when im done

hope someone can help
 
Old 12-03-2003, 10:46 AM   #2
MrGreg
Member
 
Registered: Apr 2001
Location: Hamilton
Distribution: RedHat 7.2, 9.0
Posts: 52

Rep: Reputation: 15
...what you see with nmap from the inside looking at, is different than from the outside looking at. I'll bet mysql requires authorized access, hence 'filtered'.

Port 25 is OK listening on the internal nic and serving only to internal hosts. Use netstat -ln to see what's listening and where:

tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN <=sendmail listening to all

tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN <=only on the loopback

tcp 0 0 192.168.1.1:25 0.0.0.0:* LISTEN <=bound to address

Webmin is capable of SSL and I personally encourage it's use. A properly configured firewall will remove much worry about it running. And as always, a really good root password is suggested.

If in doubt get an external audit like what you'll find at GRC
 
  


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