Application pooling / server not responding

[nathan _]

I have a webpage that can take a very long time to run, whilst it's
running it updates the user as to the progress. I run this page as it's
own application as I had problems whilst it was running it would stop
all responses to the server. This is now the same case if a second
request is made to this page whilst one is already running. The second
appears to do nothing at all.

I don't know if it's an IIS setting I need to change or something within
the page.

It's classic ASP.

Thanks in Advance

Nathan