Page cannot be displayed request entity is too large

Hi there,

We are using IIS 7, ISAPI Redirect and Tomcat to access SAP application and some of our users are receiving "Page cannot be displayed, request entity too large error".We have configured SSO and users are able to log in to application however once they start browsing reports/folders they get this error and they have to press refresh button each time.

We are not using SSL.

Please advice

Thanks in Advance