Sitrep XII

Every time I try to host a server it says "trying to set up port forwarding please wait", turns to black screen then returns and freezes and I can't do anything but task manager and quit the game. I have updated my nividia graphics card and my computer and port forwarded correctly. I have searched up answers but could find none. Before this update also was fine for me when hosting servers but ever since this new update it just does this. PLEASE HELP.