OAM Webgate FailBACK and challenge/challenge redirect URL behavior?

 Hi,

We are trying to understand the failback behavior of the OAM 10g webgate (Apache).  I've found a lot of information about failOVER behavior, but basically nothing about failBACK behavior, especially related to the challenge and challenge redirect URLs.

By "failover" and "failback", I mean:

- Suppose that we have two OAM servers, OAM1 and OAM2, and

- OAM1 has is using OracleDB1 and OAM2 is using OracleDB2, and 

- We have a single (Apache) 10g webgate that is configured with OAM1 as the primary, and with OAM2 as the secondary.

When the OAM1 server fails/shuts down, the webgate establishes a connection to the OAM2 server automatically and starts sending requests to the OAM2 server.  This is "failOVER".