How do you find out what internet ports are available?

[Raven]

How do you find out what internet ports you have available for mail and news servers? And how do you modify them?

-Raven

[BFlurie]

I know absolutely nothing about this!

However, I remembered browsing a file that had info like you requested. It's c:\windows\Services (no extension). Here's part of mine. Might try an Internet search for c:\windows\services to get more info.

# Copyright (c) 1993-1995 Microsoft Corp.
#
# This file contains port numbers for well-known services as defined by
# RFC 1060 (Assigned Numbers).
#
# Format:
#
# <service name> <port number>/<protocol> [aliases...] [#<comment>]
#

echo 7/tcp
echo 7/udp
discard 9/tcp sink null
discard 9/udp sink null
systat 11/tcp
systat 11/tcp users
daytime 13/tcp
daytime 13/udp
netstat 15/tcp
qotd 17/tcp quote
qotd 17/udp quote
chargen 19/tcp ttytst source
chargen 19/udp ttytst source
ftp-data 20/tcp
ftp 21/tcp
telnet 23/tcp
smtp 25/tcp mail
time 37/tcp timserver
time 37/udp timserver
rlp 39/udp resource # resource location
name 42/tcp nameserver
name 42/udp nameserver
whois 43/tcp nicname # usually to sri-nic
domain 53/tcp nameserver # name-domain server
domain 53/udp nameserver
nameserver 53/tcp domain # name-domain server
nameserver 53/udp domain
mtp 57/tcp # deprecated
bootp 67/udp # boot program server
tftp 69/udp
rje 77/tcp netrjs
finger 79/tcp
link 87/tcp ttylink
supdup 95/tcp
hostnames 101/tcp hostname # usually from sri-nic

[mourikise]

Hi,

BFlurie just posted a small part of the 'well-known services'. This should be far from enough for you. But, if you need a more complete one (and have linux) you can view the /etc/services file.

I use MS Outlook 2000 for e-mails on Windows. Go: Tools -> Services -> "Your account", at the last tab you can see (and also change) the port of the SMTP service. That's it.

WARNING! If your e-mail provider has its mail servers configured to use port 25 (this is the standard port for SMTP and most probable situation) and you configure your e-mail client to use another port YOU WON'T BE ABLE TO RECEIVE YOUR E-MAILS! So, don't change anything unless you know 100% what you are doing or being instructed by your ISP.

Hope this helps. http://sysopt.earthweb.com/forum/smile.gif

[This message has been edited by mourikise (edited 10-31-2000).]