Hi Rohit,
should be Fully Qualified Domain names:
sql server name (db)
olap server name (db)
insight olap server name (db)
file share server name (db)
reporting services server name (application)
application server name (application)
scheduler server name (application)
web server name (application)
Verify that these info (bpc server manager) are the same of the appserver->tblAppSetServerInfo table(they should be synchronized)
check also the DBConnectionString and the other parameters of the appserver->tblAppSetInfo table
If not successfully try search on google, this is a sql error and there are several links on the microsoft site about it (very often it's connected with server timeout and you will found hints on server settings)
Regards
Roberto
