We have a program that uses a Virtual Serial Port (USB to Serial) to do I/O. We just had the occasion where the device came in at COM7 and when we used putty to try and access that serial port putty said the port was already in use and couldn't be opened. We tried using process explorer to see what had the port open but couldn't find anything.
Is there a program anyone knows of that will go in and find all serial ports on a computer and display what has it open? We have hit this before and I think it was Kaspersky that had all the serial ports tied up but I can't be sure.