windows 2003 - why can't serial port be accessed remotely?

Posted by Danny Staple on Server Fault See other posts from Server Fault or by Danny Staple
Published on 2012-10-26T10:17:35Z Indexed on 2012/10/26 11:03 UTC
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windows-server-2003

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serial-ports

we have recently installed the updates on some of our servers, which have a bit of hardware attached via USB that presents itself as a serial (COM) port.

The strange behaviour is that if I start a cmd shell on the server via VNC, I can open the serial port. If I run a service and start it from there (telnet, jenkins) then I receive a "not found" error for it.

IE:

C:\Documents and Settings\some_user>echo 1 >COM4:
C:\Documents and Settings\some_user>

on the local cmd will work, and on the remote telnet will give:

C:\Documents and Settings\some_user>echo 1 >COM4:
The system cannot find the file specified.
C:\Documents and Settings\some_user>

I cannot see any security settings on the Device manager settings panel for this device.

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