DUNS ERROR 733
733 - The PPP control protocol for this network protocol is not available on the server.
All versions of Windows -
Installing Microsoft RRAS may disable 128-bit encryption. See this MS KB Article.
Windows NT & 2000 - TCP/IP protocol may not be correcting installed or bindings may be incorrect. See MS KB Article 168720.
Windows 2000 - This error may occur if the Negotiate multi-link option is enabled and you are dialing a normal one-call (single-link) connection. Solution: Start->Settings->Network & Dial-up Connections - right-click the connection, then Properties, Networking, Settings and clear the Negotiate multi-link for single link connections check box. See MSKB Article 244603