I have this strange behaviour under Apache/Tomcat: the first time a new browser tries to open a URL (a frameset pointing to a servlet), HTTP response is not sent back and you get "Page not found or DNS error". If user refreshes the page, everything works normally.
 
This behaviour is only evident when Tomcat is running. All non-servlets work fine when served through Apache when tomcat is shut down. Has anybody experienced a similar problem?
 
Alexander