The following is an easy way to check what processes have what ports open:
netstat -nvpl -4
Then grep for hlds, srcds etc, do some cutting and you should have your 
list of ports.

[WoF]Bucky? wrote:
> I would particularly enjoy a list of what ports need to be opened on the
> OUTPUT iptables chain so I could use a default deny policy on my firewall.
>
> On Tue, Apr 8, 2008 at 2:34 AM, Dominic Baranski <[EMAIL PROTECTED]>
> wrote:
>
>   
>> I really wish there was an official list of ports which are used.  Or at
>> least a method of finding this out easier.  I think everyone here has
>> had problems with this at least once. I can see this become increasingly
>> annoying as new services are added by valve.
>>
>> Dominic B.
>>
>> On Mon, 2008-04-07 at 19:26 +0000, Colin Silcock wrote:
>>     
>>> Hi Hans,
>>>
>>> The message is a little misleading. Your server is actually connecting
>>>       
>> to
>>     
>>> the master servers but isn't able to connect to the VAC servers. These
>>>       
>> do
>>     
>>> use a different port, so you might need to check your firewall. From
>>> memory I think you need port 26900 open, I've certainly seen this error
>>>       
>> on
>>     
>>> servers where it isn't. Good luck, let us know how you get on!
>>>
>>> Colin
>>>
>>> -----Original Message-----
>>> From: [EMAIL PROTECTED]
>>> [mailto:[EMAIL PROTECTED] On Behalf Of Hans Vos
>>> Sent: 07 April 2008 20:01
>>> To: Half-Life dedicated Linux server mailing list
>>> Subject: [hlds_linux] Error: "Could not establish connection to Steam
>>> servers."
>>>
>>> Hello,
>>>
>>> I'm having troubles with one of the Counter-Strike 1.6 game servers that
>>> we host. I already tried a complete reinstall but that didn't work. The
>>> following error occurs:
>>>
>>> Adding master server 68.142.72.250:27010
>>> Adding master server 72.165.61.189:27010
>>> Could not establish connection to Steam servers.
>>>
>>> Status gives the following output:
>>>
>>> version :  47/1.1.2.5/Stdio 3651 insecure (secure mode enabled,
>>> disconnected from Steam3)
>>>
>>> Anybody else having this problem?
>>>
>>> - Hans
>>>
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>>>       
>> please visit:
>>     
>>> http://list.valvesoftware.com/mailman/listinfo/hlds_linux
>>>
>>>       
>> _______________________________________________
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>> please visit:
>> http://list.valvesoftware.com/mailman/listinfo/hlds_linux
>>
>>     
>
>
>
>   

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