ISA proxy connection refused

[Oliver Nixon]

I'm trying to connect to a remote webservice from our company network.

At first I was getting the message "The underlying connection was
closed: The remote name could not be resolved.", this was fixed by
attaching a WebProxy to the call. But now I'm getting the message shown
below.

// ------------------ Start snippet

Explanation: The Web server refused the connection, possibly because a
service on the upstream server is inactive.

Technical Information (for support personnel)
* Error Code 10061: Connection refused
* Background: When the gateway or proxy server contacted the
upstream (Web) server, the connection was refused. This usually results
from trying to connect to a service that is inactive on the upstream
server.

// ------------------ End snippet

Our network guy is unable to find the problem.

Any help would be much appreciated!

Thanks