SSAS Cube deployment issue

Hi,

I am getting below error when deploying ssas cube in our server :

Erreur OLE DB*: Erreur OLE DB ou ODBC*: Login timeout expired;*HYT00;*A network-related or
instance-specific error has occurred while establishing a connection to SQL Server.
Server is not found or not accessible. Check if instance name is correct and if SQL Server 
is configured to allow remote connections. For more information see SQL Server Books
Online.;*08001;*SQL Server Network Interfaces: No remote client protocols are enabled and no
remote protocol was specified in the connection string [xFFFFFFFF]. ;*08001.

Have you ever got such an error or do you know how to fix this problem ?

Sincerely,