Unable to reach the central admin server

I have two backup exec server on my network, one for the Central Admin Sserver and the other for the Manage media server, but after i have install the caso on the other server, while trying to install the the manage backup exec server it gave me an error '' unable to verify if WINSVR7 is a valid Central Admin Server because of a connection failure.please verify that the user currently logged in has administrative rights to WINSVR7'' .

Both servers are up and running....

I will appreciate if there is a quick response.

thanks