Small Business Server ISA Firewall, Dual NIC Router

[sstockst]

I have a client that has installed my NetTalk application behind their ISA firewall. They are not using a hardware router but rather a server with dual NICs and ISA.

We are connecting internally no problem but cannot connect externally, through ISA. anyone have any experience with this?

thanks
--steve

[Bruce]

Hi Steve,

I don't have experience with the layout you're describing. However it sounds to me that the problem is still in the "incoming route" declaration.

Typically with a router you have to "open" incoming ports, and match them to a machine/port on the LAN. The setup you've described above would still require this "route" to be declared, even if the routing was being done in software on a Windows PC.

I have zero details for you though - merely that hint.

Cheers
Bruce

[Poul]

is your IP for your Nettalk Server bound to ip (NIC) on the Internet side? (not just the LAN ip)

i coexist with IIS, in some environments and not in others, to date i have not needed to investigate why, i have been able to simply disable iis as it was just something that MS installed by default.  so perhaps its not ISA/routing, but something already using your address/port.  (Stopping IIS can quickly rule it out)