On the regular port 7777 is the 0.2.1 server still up. But if you upgraded to the 0.2.2 client you can only connect to the new 0.2.2. servers.
0.2.2 is up and running on port 7778, for this one you need the 0.2.2 client and can not use the 0.2.1 client.
So far the server has been stable, please give us reports on not being able to connect (with the right client), crashes of client or server.