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Oracle 11g: TNS Listener extremly slow on the local server

Rafik GHAIBOUCHEJul 18 2026

Hello everyone
I’m facing a strange issue with Oracle 11g (11.1.0.6) on Windows Server 2016
Problem: tnsping response time is inconsistent. Sometimes it responds immediately, while other times it takes several seconds

Examples:
OK (0 msec)
OK (4500 msec)
OK (8100 msec)
OK (43110 msec)

Environment:

  • Oracle Database 11g Release 11.1.0.6
  • Windows Server 2016 Datacenter
  • Standalone server (not Active Directory)
  • Oracle Listener on TCP port 1521
  • Database service name: gm

What I have already checked:

  • Listener is running (lsnrctl status and lsnrctl services are normal)
  • Database is OPEN and connects immediately every time
  • Tried localhost, server IP in tnsnames.ora
  • Network connectivity (ping) is normal

Any suggestions for advanced troubleshooting would be greatly

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Added on Jul 18 2026
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