File Upload problem using Apache Commons

Hi,

We have a application running on IIS and Tomcat.All the asp pages are handled by IIS and the jsp pages are redirected to the Tomcat Server.
While uploading a file to the Server using the Apache commons file upload if the file size is 100 kb or more the upload fails due to IO stream problem.(It gives an exception Stream ended unexpectedly).This is because of the redirection of tomcat server from IIS. But if the same uploading is directly done in the tomcat sever the Commons file upload able to upload more than 2 mb fle. So only becase of redirection of IIS to Tomcat there is some problem in IO stream.

Please help me to fix this problem. Need to uplaod files more than 1mb.