I had some COM port problems connecting my mount to various planetarium apps and found this reference on a UK Forum some while ago and it helped me fix my problem.
http://www.astronomyshed.co.uk/forum...hp?f=43&t=5761
I followed these instructions and “uninstalled” COM ports with daft numbers (10, 11, 12, through to 30’s) and was then able to connect to my mount on the lower COM ports, such as 3, 4, 5, 6 or 7 depending on which Notebook I used and also depending on which USB Port I connected my 4 Serial Port adapter to.
Cheers
Dennis