[U2Lynne]

I've had my router suddenly decide to make me firewalled. Usually a reboot of the darned thing will fix it.

If you are fine on canyouseeme, then don't worry about it. TTD just does a quick check when you first connect, but after that, it is up to your bittorrent client on whether you are firewalled or not. I know Azureus will tell you if you are or not, probably uTorrent also. You can also tell if you get both Local and Remote connections on your Peer List (if you show those). If you get both, then you aren't firewalled. If you only get Local connections, then it thinks you are firewalled.