MS1987, If this is a disk, uninstall and run again, do not reroute your ports, better you default your machine, which perhaps may alleviate the problem. I have found that sometimes messing with what may seem like minor things may, in actuality be, in fact, instrumental to another application. For this reason alone you should not also block your ports, incoming can sometimes be helpful, just be sure your antivirus knows whats up, you can also use your control panels settings, in here you can block all incoming and then allow as you please when your computer notifies you of these options and you recognize. As far as the certificate thing is concerned, just ignore it, and try to go beyond it, if your software is legit it should not give you a problem, unless you give it one I guess. Check also your security settings; you may have blocked yourself from yourself. I personally allow a certain amount of incoming capabilities; paranoia is not the way to go if your desire is to network. Also, an Unknown is not always a sign of danger, it may be that your software just does not recognize as you or an updated version would be.