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How To Investigate And Troubleshoot SSL/TLS Issues on the Database And Client SQL*Net Layer (Doc ID 2238096.1)

Last updated on MARCH 12, 2021

Applies to:

Advanced Networking Option - Version 9.2 to [Release 9.2 to 12.2]
Information in this document applies to any platform.


 This note is a step by step guide to troubleshoot the most known SSL/TLS errors. 


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In this Document
 Troubleshooting steps 
  2) Verify the listener.ora and sqlnet.ora files on the database server
 3) Verify the permissions of the wallet files
 4) Check the SSL_VERSION 
 5) Enable sqlnet tracing for the listener and sqlplus connections.
 6) Use openssl to verify the TLS protocol,cipher suites and the certificates:
 7) Generate a tcpdump
 8) Get a trace for the event 10937  for utl_http service:
 9)  Verify the patching version
 Known issues
 TNS:protocol adapter error (ORA-12560)
  ORA-29024:Certificate Validation Failure
 ORA-29143: Message 29143 not found
 ORA-29106: Can not import PKCS # 12 wallet
 ORA-28860: Fatal SSL error
 ORA-29263: HTTP protocol error
  After COST is implemented the services do NOT register with the SCAN listeners.
 ORA-29259: end-of-input reached
 ORA-28750: unknown error
 ORA-28857: Unknown SSL Error
 ORA-31202: DBMS_LDAP: LDAP client/server error: Unable to open wallet
 ORA-28864: SSL connection closed gracefully

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