Proxy setup and ports, error ' HTTP Proxy:HTTP/1.1 407 Proxy Authentication Required '

 
Hello,

In my office we have a proxy for external access. The Meta WAS WORKING just with the normal proxy setup.
adress port
user and password
but from last week I can not connect anymore, I have the message
' HTTP Proxy:HTTP/1.1 407 Proxy Authentication Required (The ISA Server requires authorization to fulfill the request . Access to the WEB Proxy service is denied.)'.
It means that they changed something in the proxy setup. To ask him something, first I need to know exactly the ports that the META uses to connect the server. What I have to say for the proxy technical support?

Thanks in advance,
Wod
Reason: