Hamlib works, if it works, only with one other software. In your case it´s WSJT-X. Omnirig can
handle more softwares if all is running (multithreading) as administrator. Hamlib can´t do so.
Think it´s not a port problem it´s as it is.

73´s .. Juergen ... ALT-512 SDR (10W) , 50 m random wire at SG-211 autotuner, 2 x Xiegu G90 (20W HF TRX) one as portable Radio. Also TS-790E (40 W) for VHF/UHF with X-50 vertical and Duoband 4-Element LPDA.