Archived from groups: comp.security.firewalls,microsoft.public.win32.programmer.networks (More info?)

Hi,

I have a very simple application that listens for connection on a certain
ports and the same application that sends a message from another computer.
Both applications are the same, they send data back and forth to each
others.

I use WinXP pro for developing and Win 98/ME for testing and minor
developing.
All the machines are on the same network, (controlled by the XP Pro), and
all the machines are using ZA pro (4.5.594) as firewall. (Version 5 of ZA is
to unstable to even try it).

When I start my applications the first thing they do is 'listen' on a port,
(764 by default). Understandably Zone Alarm fires a warning that an
application is trying to act as a server but the problem is that the
application hangs at the CAsyncSocket::Listen(...) function, regardless
whether I agree to the warning or not.
I only have that problem on the Win 98 machine, it works just fine on XP
pro.

The application never seem to come back from the CAsyncSocket::Listen(...)
function.

Would there be a reason for that? Is it because of the Port number I chose?
Is so why?
I cannot ask Win98 users to shutdown their firewalls just so that my
application can connect.

Any suggestions?

Many thanks in advance

Simon.