I've got a strange problem with my isa server. When I connect to Apple's learn & earn website and I try to login I get the following error in my browser 500 Internal Server Error - The size of the response header is too large. Contact your ISA server administrator. (12216) Internet Security and Acceleration Server When I bypass the proxy server for this site I get the same error I get this error on machintosh and windows computers I use W2K with sp2 and ISA server with SP1 I searched the microsoft knowledge base for this problem but cam up with nothing. in the newsgroup there were a few messages with this problem but no solution. Does anyone knows about this problem and what causes this With regards Herman de Jong