Bug ID 1055077: Modifying the datacenter does not check GTM server configuration for prober-pool. ... If GTM is in a bad configuration state, the reload can fail with an error similar to this: 01071b63:3: The prober fallback value for server /Common/server1 cannot be the same as the inherited prober preference value. ... Unexpected Error: Validating configuration process failed. ... or 01071b62:3: The prober preference value for server /Common/server2 cannot be the same as the inherited prober fallback value. ... Two prober-pool configurations for a GSLB server is a prohibited state. ... Once this state is reached, any action that tries to validate the configuration (like a configuration load) will fail. ... This can cause the BIG-IP to fail to load configuration or cause a UCS restore to fail. ... Conditions ... 1. GSLB server has a prober-pool and inherits the datacenter selected for prober preference or prober fallback (it does not matter which prober configuration has which value).