If you're running
JSP then you must surely be using Apache Tomcat, or something very similiar? To run
ASP properly you should be using
IIS. Clearly having two webservers running at the same time is a problem, especially if they are both trying to host on port 80...
ASP can run on Apache, but it's a complicated process that doesn't always produce good results.
It does appear that it's possible to run
JSP on tomcat, with
IIS as a frontend however... this link may be useful:
http://www.jguru.com/forums/view.jsp?EID=1089940