*STABLE* and free Linux Firewall distribution

I would need a recommendation for as stable as possible free Linux firewall solution.

I would install it into Virtual machine to run on Windows server, and than route all traffic through it.

The main purpose of the FW would be to protect Terminal Server open port.
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Scott SilvaNetwork AdministratorCommented:
These are all stable ON BARE METAL.... You would need to test them to be sure they are secure enough for you...   http://www.tecmint.com/open-source-security-firewalls-for-linux-systems/

I have used some of them thru the years, but not all of them are current... I really liked pfSense, but it is FreeBSD and not linux...

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Pardon me
Do you want a Linux virtual machine to run on a terminal server?
mrmutAuthor Commented:
No. Altho that wouldn't be such a bid deal, if server is locked down well! :)
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what extra protection you want to add to TS port that windows firewall cannot do.

*ANY* linux distribution includes iptables/netfilter and uses close to mainstream kernel. Except for mayor engineering failures they are all very stable and very alike.
mrmutAuthor Commented:
Well, It is not the problem in Windows firewall, I am thinking more about one more layer of security between the server and the internet.
nociSoftware EngineerCommented:
You may want to look into haproxy then: http://haproxy.1wt.eu
that can reverse proxy / load balance etc. even on https sessions if needed (either stripping the https, or just peeking at the hostname and blind connect the ssl).
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