Unable to view Active Server Pages

We connect to the internet via WAN hardware.

We are experiencing a problem in which our clients are unable to view many Active Server Pages. No error is encountered, but the page just seems to load, and load, and load… Internet Explorer 5 andhigher is installed on each client.

We are behind a firewall, but other sites behind the same firewall are not experiencing this problem. We are using NetScape Proxy Server 3.5 (as are the other sites).