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ISA 2000 dynamic ports

Posted on 2004-08-31
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Last Modified: 2013-11-16
Hi,

is there a way to configure an ISA server to allow any communications for an application? (like in symantec personal firewall)
My problem is that we have to use video conference via MSN Messenger, and I've read a lot of hints and tips on what ports should be opened. I opened them but it still doesn't work.

thanks in advance.
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Question by:thegroover
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This is a general problem on ISA 2000, see what microsoft says:

http://www.microsoft.com/technet/prodtechnol/isa/2000/maintain/isaimsec.mspx
SIPS. Features such as voice, video, application sharing, and whiteboard require a connection to be made between an internal and external client, and use SIP Signaling (SIPS) to set up the communication session, which then uses dynamic ports. For example, using audio/video (AV) requires opening all UDP ports between 5004 and 65535 to allow SIP and media streams (RTP) to cross the firewall. The use of dynamic ports without an associated application filter is a problem because ISA Server does not have information about which ports to open and at what time. No ISA Server SIP application filter is available to circumvent this issue.

or
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/rtcclnt/rtc/traversal_of_upnp_enabled_nats.asp

The usual solution is to open a wide range of ports above 5000 to allow video streaming. And this is a security risk. Try Net-Meeting for this.
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well, thanks anyway guys, the articles are usable.

G
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