"Error 630" or "Port Is Invalid or Busy" When Dialing Out with a Modem
Q227995
http://support.microsoft.com/?scid=kb;EN-US;Q227995

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Regards
Ron Badour, MS MVP W98 System
Tips: http://home.satx.rr.com/badour
Knowledge Base Info:
http://support.microsoft.com/default.aspx?pr=kbinfo
> while trying to dial up getting an error called
> "communication port is invalid or busy"
> please help me