USB-to-Serial Losing COM port in 2000 but not in XP



We have an application that is working with Windows XP
without any problems but is not working with Windows
2000. The program communicates over a USB to serial line
with a modem. At least once an hour the program stops
communicating directly with the modem and begins a
Windows PPP session. After a connection has been made the
program sends information by ftp and then hangs up. When
we run this program in Windows 2000 sometimes we are no
longer able to communicate over the COM port with this
program or with other programs like HyperTerminal. When
we disable and enable the program in Device Manager or
unplug and plug in the USB the program starts working


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