Local Connections Are Not Working ORA-12157 "TNS:internal network communication error"
(Doc ID 399342.1)
Last updated on JANUARY 30, 2022
Applies to:
Oracle Database - Enterprise Edition - Version 8.1.7.4 to 11.2.0.2 [Release 8.1.7 to 11.2]Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
Every attempt to login locally to any database (using "sqlplus '/ as sysdba'") fails with the following error :
ORA-12157: TNS:internal network communication error
The truss output of the login attempt shows :
...
2899: brk(0x1002291B0) = 0
2899: brk(0x10022D1B0) = 0
2899: so_socket(2, 1, 0, "", 1) = 9
2899: setsockopt(9, 65535, 4, 0xFFFFFFFF7FFF7114, 4, 1) = 0
2899: bind(9, 0x10022C700, 16, 3) Err#126 EADDRNOTAVAIL
2899: close(9) = 0
2899: lseek(8, 0, SEEK_CUR) = 0
2899: lseek(8, 0, SEEK_CUR) = 0
2899: lseek(8, 0, SEEK_CUR)
...
SQL*NET trace shows :
[24-JUN -2009 15:06:02:212] nttbnd2addr: using <localhost IP>
[24-JUN -2009 15:06:02:212] snlinGetAddrInfo: entry
[24-JUN -2009 15:06:02:212] snlinGetAddrInfo: exit
[24-JUN -2009 15:06:02:212] nttbnd2addr: using host IP address: <localhost IP>
Truss confirms that the failure happens from Oracle Net system calls. The OS bind() function fails with an Err#126 EADDRNOTAVAIL. This suggests there is a problem with the local IP address or with the available sockets.
Changes
Configuration of IP settings on the host was done.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |