If BCC communication between peer clusters is not functioning, the problem might be caused by one of the following conditions:
The credentials for the remote cluster have not been set.
You cannot use iManager on a server in one tree to set credentials for a BCC cluster in another tree. This is because BCC and iManager use the tree key to encrypt the credentials. Setting credentials by using iManager in a different tree uses an invalid tree encryption.
A firewall is blocking port 5988 or 5989 (CIM communications using OpenWBEM).