There are two types of browser authentication supported by most browsers: Basic Authentication (Clear Text) and Windows (NTLM) Authentication. Basic Authentication is supported by most internet web servers, but Windows Authentication is primarily supported by Microsoft IIS and is cannot be used to authenticate over the internet. NTLM authentication is used fairly frequently on Intranets. WSP+ 4.0 supports Basic Authentication and it can be configured in the agent properties window. WSP+ 4.0 does not support NTLM authentication.
If you find that you need to access a site that requires Windows Authentication or if you are running WSP+ 4.0 behind a Microsoft Proxy or IAS server that requires NTLM authentication then you still have options. You can set up a local proxy on the WSP+ 4.0 machine that translates normal requests and sends them through the MS Proxy with NTLM credentials. There is a free one located at http . It is aptly named "NTLM Authentication Proxy Server".