Why does Jigsaw reply" HTTP 501 not implemented"?

Calls are made from  servlet-generated HTML to static HTML-files with applets.
The calls to the same page works sometimes but sometimes not .
Then the result is an error-page with the reply "HTTP 501 not implemented".
Jigsaw webserver is running on port 8001 while Apache webserver is running on port 80. Could this cause the problem or do I need to change some settings in Jigsaw?
Some of the calls from static HTML-files to servlets also
results in "internal server error" or white pages even if there is no 
errors in the Java-based application.

Received on Tuesday, 17 April 2001 11:05:24 UTC