Media servers might become network isolated for the following reasons:

• Network switch failure or misconfiguration

• Network interface card (NIC) failure

• Network cables damaged or removed

When servers that are part of a 1+1 High Availability cluster are isolated from the network, they cannot communicate with each other. Both servers then enter the active High Availability state. However, only one of the servers is actually processing sessions.

To prevent loss of user sessions when the server is recovering from a network isolation condition, you must lock the High Availability state on the server that you determine is active and processing the sessions.

After the network isolation issue is resolved and both servers are back on the network, unlock the High Availability state in both servers to provide failover redundancy.

Use this procedure to recover High Availability servers from network isolation.