Problem analysis

[maxthegold]

I am having trouble with a couple of applications not being able to get through to the Internet. What I was wondering is how do I find out what is happening and what may be going wrong when I run these progs. I cannot find much evidence of anything in Gatekeeper. I would like to know how to fix these problems myself, you know teach a man to fish.....

Regards,
Mark.

[Pascal]

Diagnosis depends on how you connect out to the internet (From the client). Normally, for NAT you should not need to configure anything. WGIC might require a bit more attention, while a proxy connection will mean you'll need to setup mappings, etc. to get it to work.

Which one are you using?

[maxthegold]

Yes I am using NAT. I have a program that is trying to communicate via the internet and it is not working. I am running it on the Wingate server machine at the moment and I cannot see any evidence of anything happening at all. How do I find out what this program is trying to do.

[adrien]

basically the last word in network troubleshooting is a network packet sniffer.

something to see at the lowest level exactly what is being sent on a packet level by your application.

that plus a basic knowledge of TCP UDP and IP routing is basically as good as you can get for tracking down issues.

we normally use a product called Commview for this. Our own product NetPatrol will also capture packets, but not being designed as a protocol analyser, doesn't have the filtering a search capabilities in its packet capture viewer that Commview and other packet sniffers have. Not yet anyway.

Adrien