:6400 not found or server may be down(FWM 01003) null Error

Dear Experts,

While login to BI Launchpad we are unable to login to BO Server and we are getting "Error:Server <Server Name>:6400 not found or server may be down(FWM 01003) null".

Reply will be really appreciated.Please suggest what are the reasons,how to can i able to login to the server.

Regards,

Venkat