isn't it mort that is hosting the build server?
try pinging mort.openredstone.org and connecting to that ip. idk what port mort is hosting the server on so if 25569 doesn't work, try 25565. else idk what it could be
figure out who hosts the teamspeak server, figure out what domain points to them, figure out at what port teamspeak is running on, use that combination of ip and port to connect instead
I cannot help you any further because I do not actually know who hosts the ts server or at what port it runs on