Papa6, I do not know what the problem can be. I have had the same problem with some of John's maps but the problem seems to go away after a while, then everything works like it should. Sorry I can not be any help on this.
Yes, I can connect and play on other servers. Also, if I set my computer to be an online server people can connect to it. But I have to be playing on that computer as well. That is not the computer I like to play on as My new computer is faster. I do not like to set it as Online server because when I quit everyone else has to quit as well.
However, when I set one of my computers up as a dedicated server, it does show up in the list of servers, but we cannot connect to it.
WE just get a ping-pong connecting to server message. I had another player try from his computer, he could see it in the list but got the same ping-pong effect.
We play on Tuesday and Thursday night starting around 8 PM EDT for about 3 to 4 hours, sometimes on Saturdays at the same time.
I see where you have already submitted a request to join the server. The Server Admin will have to approve you, at which time you will be able to get in game whether or not anyone else is playing as the server is up 24/7.