I'm using a W2K server running HL2DS (latest update from today) with the built in IPSec firewall.
I used this page to figure out how to configure the firewall: http://homepages.wmich.edu/~mchugha/w2kfirewall.htm (It is a pretty good tutorial)
I have read this page about steam ports: http://steampowered.custhelp.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=160
It says which ports need to be open for a dedicated server. I have blocked all inbound UDP packets, except for those ports. I have blocked all inbound TCP packets, except for those ports. I have enabled all outbound UDP and TCP traffic. I have blocked all ICMP traffic (inbound & outbound).
Also, on that steampowered page, there is a section on ports that need to be opened for steam and steam games.. I am assuming that dedicated servers do not need those ports opened too?
I can join the server, but I get the error message that my steam ticket could not be validated. I hope I don't have to enable all the client ports, only because the IPSec interface is cumbersome and it will kill my wrists clicking so many buttons to get the job done.
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