Troubleshooting ORA-3135 Connection Lost Contact
(Doc ID 787354.1)
Last updated on FEBRUARY 14, 2025
Applies to:
Oracle Net Services - Version 10.2.0.1 and laterGen 2 Exadata Cloud at Customer - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database - Enterprise Edition - Version 11.2.0.3 to 12.2.0.1 [Release 11.2 to 12.2]
Oracle Database - Standard Edition - Version 19.5.0.0.0 to 19.5.0.0.0 [Release 19]
Information in this document applies to any platform.
Purpose
Explains why a 3135 error is returned and helps to diagnose the underlying problem.
Troubleshooting Steps
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In this Document
| Purpose |
| Troubleshooting Steps |
| (1) Transparent Application Failover (TAF) |
| (2) Idle Connection Timeout |
| (3) Firewall Manipulating Sqlnet Data. |
| (4) Data Required for Further Analysis |
| References |