bbd:Service unavailable (Connection refused) for xymon client

hello,
i am getting

Service unavailable (Connection refused) for bbd (red) and client data
is also showing.klogs on clients say;:


in logs it says


hobbitclient.log
2009-04-20 22:54:00 Could not connect to bbd at 172.29.2.252:1984 - No
route to host
2009-04-20 22:54:00 Whoops ! bb failed to send message - Connection failed
 but ping and telnet is fine from client and also bb-hosts entry is correct..
wt is wrong?
help


-- 
Pankaj V. Dorlikar