Contributed By: Cliff Hobbs [MVP SMS]
8019xxxx errors are HTTP errors.  The following table should hopefully give you a quick reference to what the errors mean which should hopefully allow you to resolve the problem.

If you know of any others or have anything to add to the table please feel free to email us.
 

SUS Code	HTTP Code	Description
0191	401	Unauthorized/ Access Denied – Probably caused by an invalid username or password being specified
0193	403	Forbidden – You don’t sufficient permissions to perform the task you are trying to achieve
0194	404	Not Found – The file you are trying to access doesn’t exist  (it may have been moved)
0195	405	Method Not Allowed
0197	407	Proxy Authentication Required
01F4	500	Internal Server Error – This message can have several causes.  Start by looking at Event Viewer on the server for more information
01F6	502	Bad Gateway – You’ll see this error if you try to run a CGI script that doesn’t return a valid set of HTTP headers
01F7	503	Service Unavailable