localhost port address?

Question

Hey all,

Sorry for this question - seems to be quite basic, but I've done some googling and not been able to find anything. I'm basically starting out in WCF and currently working through 'WCF Unleashed' book. The first example has given me a problem tho! :o(

The config file has the end point define as:
<add baseAddress="http://localhost:8000:Derivatives/" />

However when I run my app up, I get an exception saying that end point couldn't be found. I'm new to web programming, so maybe off the mark here - but I presuming its the port thats incorrect - how would I find out what port my application is running on?

Thanks in advance...