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VMS: Troubleshooting Guide for TNS-12500 Errors on Alpha OpenVMS (Doc ID 93322.1)

Last updated on APRIL 14, 2022

Applies to:

Oracle Net Services - Version to [Release 9.2 to 10.2]
HP OpenVMS Itanium
HP OpenVMS Alpha


This document is intended to help in resolving the most common reasons for ORA-12500/TNS-12500 errors on OpenVMS in Oracle 9.2 and up. Much of the information also applies to versions of Oracle on OpenVMS going back to 7.3.3, but this document concentrates on newer versions.

This  article does not include Oracle Names Server problems, it is only based  on systems that make connections using TNSNAMES.ORA.

The intended audience is Oracle personnel, and Oracle customers who encounter this error.

Troubleshooting Steps

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In this Document
Troubleshooting Steps
 Recommended Reading
 A. Basic Checks
 A.1 Setup your basic test environment
 A.2. Ensure ORASRV_NETV2.COM is setup correctly.
 A.3. Check the ORASRV_NETV2_<SID>.COM specification in LISTENER.ORA
 B. Beyond basic setup analysis
 B.1.  Check the login command files
 B.2. Check Account privileges
 B.3. Check the SQLNET.LOG file.
 B.4. Check the OpenVMS Accounting file
 B.5.  Check your system resources.
 B.6. If your TNS errors are still not resolved

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