ORA-21561: OID generation failed

Problem:
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ORA-21561: OID generation failed


Solution:
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Check that there is client machine fully qualified name and short name in the client machine hosts file. If these are missing you’ll get ORA-21561 errors when trying to connect server.

old           /etc/hosts   file
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127.0.0.1            localhost.localdomain      localhost

new           /etc/hosts   file
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127.0.0.1            localhost.localdomain      localhost
10.160.116.10   dbachannel.oracle.com     dbachannel-----this line added