Never Mind issue resolved now…
Added the server IP in proxy exception list along with localhost,127.0.0.1
the whole command went like below
from root user
#cd /opt/BESServer/bin/
[root@<Server Name"" bin]# ./
BESAdmin.sh -setproxy -proxy=http://proxyserver:8080 -exceptionlist=localhost,127.0.0.1,ServerIP
Below was the result
BESRootServer (pid 24708) is running…
Stopping IBM BigFix: BESRootServer: [ OK ]
Starting IBM BigFix: BESRootServer: [ OK ]
Now issue resolved.