cosimo mercuro - 2010-01-13

When I attemp to acces  an internal resource (an IP phone) from an internal, remote, webmin server using webmin http tunnel feature, after I've entered the password of the internal IP phone , I receave this message in the http tunnel window of the internal webmin server:
"Failed to lookup IP address for dologin.htm" and it is impossible to login to the phone.
The webmin server is a remote server and I access it from the I.E 7.0 browser of my PC by https://PublicIPAddress of the webin server.
Any idea?
Thanks in advance.
Ing. Cosimo MERCURO