As if this hasn't answered your question already:
(11:02:07 am) CallofdutyUrT: Was 1up Jump Server how to connect on the latest version of Urban Terror?
(11:09:43 am) RonaldLee[1up]: We don't have a jump server any longer.
We "no longer" have a jump server. Whenever we moved to 4.2, we moved all of the servers. Eventually, RonaldLee[1up] cut all of the servers in 4.2 that were not being used. Hence, no jump server. No-one was using it, and Ron cut it.