1) create sqlnet.ora in $ORACLE_HOME/network/admin with this content
# SQLNET.ORA Network Configuration File: /oracle/app/orai911/product/9.2.0.1.0/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.
tcp.validnode_checking = yes
tcp.invited_nodes = (szmesdb01)
2) reload oracle listener
Lsnrctl reload test[@more@]
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