SSRS Report Builder 3.0 using behind a proxy server

Has anybody successfully used Report Builder 3.0 on a company network (that uses a proxy server) to access and build reports on a server that is not part of that network?

We have forms authentication, and all works wonderfully in Report Builder 3.0 when the computer is ‘on the internet’ (NATted, s开发者_如何学JAVAay at home), but the works proxy just won’t allow a connection… any clues as to what needs forwarding / configuring?

It worked, if u got any problem with the default proxy, try the ip address