Further Information
CHART 1: Basic Checks for Outstations with no Communications.
CHART 6b: Network Comms - Channel Not Failed.
Windows DNS and its use of random UDP ports to help ensure system security, see:
- http://www.microsoft.com/technet/security/bulletin/ms08-037.mspx
- http://support.microsoft.com/kb/953230.
Network diagnostic tools: We recommend using tools such as the Microsoft® Windows® netstat command line tool, or a third-party tool such as Microsoft® Sysinternals™TCPView.