I have used a payment provider to accept payments, its all working fine but on my dev server I get an error.

The provideer returns to my site with a large querystring (around 650 characters) this causes in firefox the followign error:

The connection was reset

The connection to the server was reset while the page was loading.

The site could be temporarily unavailable or too busy. Try again in a few
moments.

If you are unable to load any pages, check your computer's network
connection.

If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web.

I can remove some querystrimng values and the page loads ok, is there an iis setting I need to change? I have full access to the server whiocgh is windows 2003 running iis 7