Introspecting the service

Question

I'm trying to use Flash Builder 4 to connect to data/service but for some reason I cannot get it to introspect WSDL that is on another server on my network (or locally for that matter). It does not give a error but it just never completes and eventually closes and returns back to the "specify a WSDL url to Introspect.
Any logs that I can look at to determine what step it's getting hung up on?

Answer 1

Since this seems to be a common problem I'll post a solution here that worked wonders for me.
The key issue as identified above is that when running the introspection, repeated calls to www.w3.org are taking a lot of time, so it appears the progress dialog has "frozen" when it fact it is working, only very slowly.
This can be circumvented by using Fiddler, the web debugging proxy. Fiddler has an autoresponder that can be used to respond instantly. Here's how you do it:
Install Fiddler2 and start it. Remember that you need to start Fiddler as an administrator. Fiddler acts as a proxy for all HTTP clients on the computer when it's running, including Flash Builder. It removes itself as a proxy as soon as you turn it off.
Start Flash Builder.
In your project, select "Connect to Data/Service...", select "WSDL" and go through the first page of the wizard. Once the progress dialog shows up and apparently "freezes", look in Fiddler.
You will notice there are calls to www.w3.org that are very slow. They take about 30 seconds each to complete. The four offending URLs are...
/TR/xhtml1/DTD/xhtml-special.ent
/TR/xhtml1/DTD/xhtml-symbol.ent
/TR/xhtml1/DTD/xhtml1-transitional.dtd
/TR/xhtml1/DTD/xhtml-lat1.ent
Let the four URLs complete one response each. They must have a response that is HTTP 200 (OK), and a body length that is not -1. I've gotten 504 on rare occasions, and the body length is -1 until the request has completed.
Click the "AutoResponder" tab.
Check the box "Unmatched requests passthrough".
Check the box "Enable automatic responses".
IMPORTANT 1: Do it in that order! "Unmatched..." first, "Enable..." second. Otherwise you might lose a few responses.
IMPORTANT 2: Do not check the box "Enable latency", because that's what we're trying to avoid here.
Drag and drop - from left to right - the 4 offending requests. Fiddler will make 4 autoresponder rules that will respond instead of w3.org.
Now just sit back and watch the process finish quickly.
Hope this helps.
/Michael