Anybody know of a utility to trace/debug activity at a port?

Quite simply, I have a service running on an embedded XP system that
(should) be listening on port 1300. I have a diagnostic perl utility
that will test that port by addressing it (from the outside), look for
a response and respond as to whether it got one or not. For example I
could pass it the server name and port 80 and it would reply back in
the affirmative.

I am not getting a reply back from the port my service is running on.
But I don't know how to further debug what is going on at the port
level. As I write this I'm thinking perhaps Ethereal? Anyway, any
ideas would be appreciated.

-Jim

Depending on your switch you could turn on debugging for cef. That will tell
you if the packet is going to the correct port. It must be a layer3. Or you
could just try a new switchport. Can you telnet to another TCP port on the
XP box? Could you temp open a port and try it? That will ensure layers 1-3
are good.

<(E-Mail Removed)> wrote in message
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> Quite simply, I have a service running on an embedded XP system that
> (should) be listening on port 1300. I have a diagnostic perl utility
> that will test that port by addressing it (from the outside), look for
> a response and respond as to whether it got one or not. For example I
> could pass it the server name and port 80 and it would reply back in
> the affirmative.
>
> I am not getting a reply back from the port my service is running on.
> But I don't know how to further debug what is going on at the port
> level. As I write this I'm thinking perhaps Ethereal? Anyway, any
> ideas would be appreciated.
>
> -Jim
>