oracle doesn’t find its client

If an oracle client isn’t able to resolve client hostname, throws an
ORA-21561: OID generation failed

On log/listener.log I found
20-MAR-2013 16:15:30 * (CONNECT_DATA=(SID=test)(CID=( * (ADDRESS=(PROTOCOL=tcp)(HOST=

The client hostname was managed via DHCP, so the hostname wasn’t in /etc/hosts.

The root cause of the issue was a slow DNS response – so adding the client hostname on the client machine fixed the issue.

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