Can an ISP block data coming into a flex app?

[bazjapan]

Hi,
I am currently developing a room booking application.
http://barry-jones.com/roomApp/base.html

It draws data from web services built in asp.net hosted on the same server.
Now, on mine and most of the machines I have tested on the application and the data comes in no problem.
However, in a couple of cases, no data is coming into the flex app. Also no
For the life of me I can't fathom why,

I'm pretty sure it isn't :
a) a broswer issue.
b) a flash player issue - all systems have had version 9.0.28 installed.
c) not an OS issue.

The only thing I could possible think of is that it could be related to either
the ISP or the router being used.
It this possible? Can the data be blocked?

Has anyone had a similar situation?
What other measures can I take to determine what is happening?
Any help appreciated.

Barry:confused:

[flexy]

Flash apps communicate through port 80, like your browser does, so if you're getting web pages in your browser the answer to your question is "no".

Can you load the WSDL when you instantiate the WebService component? Is it just the call to a particular operation that's failing, or are you getting absolutely nothing?

Have you tried browsing to the WSDL using IE or Firefox?