I had this same problem. I’ve tried everything even wiped out and reinstalled my fogserver but could not get it to work. I was playing around with Fogclient and somehow clicked on Run as administrator when installing. Restarted my host client. Ta…da…Problem solved. Tested on two more host clients. All is well. At least this fixed my problem. I hope it does to you too.
Thanks Fog admins for all the hard work!.