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When running ArcSDE 10.2 command line tools on Oracle 184.108.40.206.0, the following error is returned:
Error: "Error: Underlying DBMS error (-51) Error: Could not create a connection Extended DBMS error code: 0 Unknown error No extended error"In addition, the following error message is observed in the sdedc_oracle.log file:
Error: "db_get_dbms_release:: Invalid Release (220.127.116.11.0) Cannot determine DBMS release using SDO_ADMIN.sdo_version function. Can’t open instance:sde:oracle11g. Spatial Engine Connection Failed (-51). Cannot Get Access to Instance sde:oracle11g."
The error is encountered because Oracle version 18.104.22.168.0 is not supported in ArcSDE version 10.2.
Install ArcSDE version 10.2.1 or 10.2.2 command line tools for successful execution as the support for Oracle 12C begins at ArcGIS version 10.2.1.