To check network connectivity issues with the 2100-NET system, check the following:

• With a Tools backup
  
  Use the Event Viewer to load the sysevent log from the backup, and then look for tcpip error messages in the log.
  (Control Panel, Administrative Tools, Event Viewer. click Action, Open Log File and browse to the file sysevent.evnt and set Log Type to System)
  
  
• With a Tools Backup including data
  
  Look at the Operating Log for Socket Error Messages, such as 10060, 10065.
  These numbers can be searched on the web with the word msdn.

  (search for "msdn 10065" for information on the error number 10065)

  Some codes are simply non critical notifications, others are errors that indicate problems.