Reason : Connection Refused: connect

Untill a week ago i was able to connect to this HP vertica server now suddenly (after update) i am unable to do so any help would be usefull..
(i do not have controll over the server)
this is the message that i get.
[Vertica][VJDBC](100176)Failed to connect to host ragnar.roveo.ru on port 5433. Reason: Connection refused: connect
(i do not have controll over the server)
this is the message that i get.
[Vertica][VJDBC](100176)Failed to connect to host ragnar.roveo.ru on port 5433. Reason: Connection refused: connect