Tomcat
From Sage CRM Knowledge Base
Troubleshooting:
1. Ensure parent paths is set to true for ASP
ISAPI Rewriting
1. Sage use a file called "....Sage\CRM\Services\IISUtils\CRMRewriter\ISAPI_Rewrite.dll" which is created by "Helicon" (http://www.isapirewrite.com/)
Useful articles: