Thank you very much,
I supose that I had a problem when the network failed in one node, and when it back online the VSA-VM did'nt run OK.
In VSA Manager all were OK, but the synchronization did'nt starts and the replication were degraded. When I restart VSA-VM the synchronization started and the replication turns online.
I will add e-mail alerts to network failures in vcenter in order to check VSA Manager status after this problem.
Thanks a lot of!!
Dolors.