A SOA Security Manager Agent running on a multi-process web or application server (such as an Apache-based server running in pre-fork mode) opens the same number of connections to all configured Policy Servers, regardless of whether failover has occurred or not.
When failover occurs, it happens independently for each child, because each child process has its own connections to the Policy Server. This results in a 500 error for each socket as failover takes place. After the primary Policy Server comes back up, the sockets opened to the failover server remain open. All new sockets are opened to the primary Policy Server.
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