1 ~ 2 months ago after patched Windows 7 Pro. 32 bits, the VMware guest cannot access to the host serial port. Need to manually disable the serial port (in host) and enable it back; than the guest can connect to it (serial port which connected to a dot matrix printer). Once reboot / shutdown the host the problem comes back. It looks like the serial port is occupied by some program when the Windows started. How to find out which program is using the serial port. Can anyone help? Thank you in advance.

Hi, We can boot into Clean Boot environment to make sure the issue is related to third party programs or not. In addition, the issue is more related to VMware, I recommend contacting their support directly. http://www.vmware.com/support For you reference:. http://www.vmware.com/support/ws3/doc/ws32_devices3.htmlKim Zhou TechNet Community Support

Hi, We can boot into Clean Boot environment to make sure the issue is related to third party programs or not. In addition, the issue is more related to VMware, I recommend contacting their support directly. http://www.vmware.com/support For you reference:. http://www.vmware.com/support/ws3/doc/ws32_devices3.htmlKim Zhou TechNet Community Support

Thank you!!! I will try it.