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Asked: 2026-05-13T09:01:05+00:00

I have a .net Application that writes text to a serial COM port, a

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I have a .net Application that writes text to a serial COM port, a POS reciept printer to be more exact. i am using the Rs232 class library to write and read to a serial device.

My problem is now with some clients that have updated their operatingsystem to WIN7 64bit version, have trouble to create a connection to the COM-port.

the com-port seemes to get occupied with some other process and that blocks my application to opening a new connection. so for my question, does anyone know how i can close all connections to a com port? or see whats blocking it? once again this seems to only to affect win7 and 64bit users.

thanks

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1 Answer

  1. Editorial Team

    You’ll have to find the process that is hijacking the COM port. SysInternals’ Handle utility should help you find it. Other than that, I’ve seen the Telephony service grab a COM port on one of my machines.

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