Hi,
The Portal URL is broken down as such
[Transport] :// [Server Name] OR [FQDN] : [Port Number] / [Virtual Directory]
In your example:
HTTP is the Transport
NESANSERVER is the Server Name or a Local DNS Name that maps to an IP Address
3030 is the Port number
MAINSITE is the Virtual Directory
They must all be in this order. The Portal name can can be whatever you want so long as you don't use reserved characters. Note: a Portal Name is not the same thing as a URL.
Example No 1 will can work, Example No 2 cannot work, Example No 3 can only work if you have domain with the extension "main".
Paul Leigh