Windows Server 2003 Port Monitoring Utilities - See what ports an application is trying to use.

I'm looking for any ideas on an easy-to-use, preferably free, utility which can help me determine what ports an application is trying to use when communicating with the network or other servers.

ie. A server is "supposed to be" communicating through ports 1433, 2121, and 8085. I'm told those ports are open through the firewall by our networking team, but the application fails to work properly.

I have tried wireshark but this is really a complex tool. Anything else out there which could help me?

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

From a command prompt - netstat -b

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Use TCP view. you can download for free and is a great resource. You can also download wireshark and capture all traffic and ports.

My suggestion is using TCP View located here, its a Microsoft product from sysinternals. There are lots of good tools here. 
ottobockAuthor Commented:
So far - I'm using both of your recommendations - and this is helpful!!
I was checking using NETSTAT before, but not with -B. Hmm, let's see how this (crappy) app is thinking. :-)
ottobockAuthor Commented:
Network monitoring and tricks are still my weakest area in IT - big thanks for your advice!
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Network Analysis

From novice to tech pro — start learning today.