Oracle Wallet Error in Red Hat High Availability Resource
In case anyone is interested in the solution that was identified:

The sqlnet.ora in question contained the following:

ENCRYPTION_WALLET_LOCATION =
   (SOURCE =
     (METHOD = FILE)
       (METHOD_DATA =
        (DIRECTORY = ${ORACLE_BASE}/admin/${ORACLE_SID}/wallet)
        )
   )


Which worked fine with the oracle user profile on the server.  However, when running inside the HA resource, the environment variables were overridden, and ORACLE_BASE was not defined.  Thus when oracle started, the system attempted to locate the "/admin/${ORACLE_SID}/wallet" directory, and upon not finding it, defaulted to a "wallet closed" state.  Queries about the wallet when the database is in this state returned a null record.

When we attempted to troubleshoot the issue, we logged into the host server as oracle, got the user profile from the shell, and thus when we started sqlplus and ran queries it was able to resolve the ENCRYPTION_WALLET_LOCATION and populate the record in the table.  Thus all local queries worked, and suddenly all remote queries "started working" again with little indication in the logs of what had taken place behind the scenes.