Hi,
I suppose the problem comes from the fact you are now going through a proxy even for local addresses.
We are not providing an option for calling SharePoint web services through a proxy.
Couldn't your IT team configure more specifically the proxy settings in such a way that the proxy is bypassed for local addresses?
Or even being even more specific regarding addresses (SharePoint server) that do not go through the proxy server?
I will however fill a request in our database so that such an option can be implemented in Enesys RS Data Extension.
Regards,