Ports required for Various Services/Applications

In addition to those applications described in the /etc/shorewall/rules documentation, here are some other services/applications that you may need to configure your firewall to accommodate.

NTP (Network Time Protocol)

UDP Port 123

rdate

TCP Port 37

UseNet (NNTP)

TCP Port 119

DNS

UDP Port 53. If you are configuring a DNS client, you will probably want to open TCP Port 53 as well.
If you are configuring a server, only open TCP Port 53 if you will return long replies to queries or if you need to enable ZONE transfers. In the latter case, be sure that your server is properly configured.

ICQ   

UDP Port 4000. You will also need to open a range of TCP ports which you can specify to your ICQ client. By default, clients use 4000-4100.

PPTP

Protocol 47 (NOT port 47) and TCP Port 1723 (Lots more information here).

IPSEC

Protocols 50 and 51 (NOT ports 50 and 51) and UDP Port 500. These should be opened in both directions (Lots more information here and here).

SMTP (Email)

 TCP Port 25.

RealPlayer

UDP Port 6790 inbound

POP3

TCP Port 110 (Secure = TCP Port 995)

IMAP

TCP Port 143 (Secure = TCP Port 993)

TELNET

TCP Port 23.

SSH

TCP Port 22.

Auth (identd)

TCP Port 113

Web Access

TCP Ports 80 and 443.

FTP

TCP port 21 plus look here for much more information.

SMB/NMB (Samba/Windows Browsing/File Sharing)

TCP Ports 137, 139 and 445.
UDP Ports 137-139.

Also, see this page.

Traceroute

UDP ports 33434 through 33434+<max number of hops>-1
ICMP type 8 ('ping')

NFS

I personally use the following rules for opening access from zone z1 to a server with IP address a.b.c.d in zone z2:

ACCEPT	z1	z2:a.b.c.d	udp	111
ACCEPT	z1	z2:a.b.c.d	tcp	111
ACCEPT	z1	z2:a.b.c.d	udp	2049
ACCEPT	z1	z2:a.b.c.d	udp	32700:

Note that my rules only cover NFS using UDP (the normal case). There is lots of additional information at  http://nfs.sourceforge.net/nfs-howto/security.html

VNC

TCP port 5900 + <display number>

Didn't find what you are looking for -- have you looked in your own /etc/services file?

Still looking? Try http://www.networkice.com/advice/Exploits/Ports

Last updated 7/30/2003 - Tom Eastep