I think i can!
A router can be a problem due to with having one installed keeps most ports blocked due to it cannot tell which ones are always good. So threfore it blocks incomming traffic to all ports mostly except the ones it was told not to.All game ports from what im aware are blocked by the routers so therefore since it thinks its a bad port or ports it blocks them so you have to do port forward/configure your ports to allow people using the gaming community system online, which would be Novaworld in Joint Ops case,to be able to pass through to your port for hosting and get into your server.
As for if viruses get through to it from that port; it can cause your router;s settings to screw up or worst.
I have never had that happen, so dont worry about it too much.
I hope this answered your question!
I use Linksys
