We have a company Intranet - it works fine when accessed internally. We are using Proxy as a firewall, and have set the Intranet up so that it can be accessed from the Internet, outside of the firewall. Could anyone tell me how I can set security (in IIS or Windows NT) so that if the user is accessing the intranet externally, they will be prompted for their NT logon and password, but if accessing it internally no logon or password would be needed. Any suggestions would be appreciated.