Munro
Deity
You changed ip and munro didn't add you?
I don't think that's it. I've opened up the firewall to allow connections from any IP (for the appropriate ports) and both dV and hellwitch have been able to connect since then - from new IPs - without any further intervention from me.
Ronnie - as discussed, could be that you are trying to connect to the wrong IP, since this was also the problem for dV yesterday - maybe a typo in a PM or IM that I sent both of you? Either way it seems specific to your setup somehow so we'll sort it out over PM / IM (would rather not post my external IP on a public forum).
Edit: working again now; there was an issue with my firewall settings. All required ports should be open now.