An Error Occurred message received with Norton WiFi Privacy

An Error Occurred.  Sorry, the page you are looking for is currently unavailable.  If you are the system administrator of this resource then you should check the error log for details.  Faithfully yours, nginx.  I also have the slow speed problem mentioned in this forum.  Support connected to this PC last night and could find no problem.  NGINX suggested calling Norton.

This error is received intermittently when loading URL's.  When Norton WiFi Privacy is disabled the URL's load without error and much more rapidly.