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ModemHelp.Net Recommends: Free System Scan for PC Errors

7164 - An unknown Open Transport serial port was referenced.

1.  Make sure that the correct port is selected for the modem and that the modem is not plugged into the wrong port (ie printer port.).

2.  Make sure appletalk, fax software, or anything else that might use the port is not active.

3.  Try a reboot.