>>Hi everybody,
>>
>>We have a local service written in C++ which listenes on some ports (which we can configure). In my case I usually can not get the service to listen and the only solution I found so far is to re-boot, start that local service and then open my applications as usual.
>>
>>This is of course a bad workaround and I'd rather know which application is interfering so I can close that application if needed.
>>
>>So, my question is - how can I know what ports are used by which applications and what ports are free?
>>
>>Thanks in advance.
>
>
>http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx

Thanks, looks like what I need.