If an Oracle 10G system restarts unexpectedly, it might cause the ORA-12505 in some cases. I tried just waiting for awhile and restarting OracleServiceINSTANCE. This worked for this instance of a OS Failure. It looked like the listener was running correctly but Oracle Service couldn't connect on first boot after failure. Otherwise it might be a issue with the connector. The link below has some connector tips.
http://ora-12505.ora-code.com/
Thursday, December 4, 2008
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