Fatal ni connect error 12500

fatal ni connect error 12500

Fatal NI connect error 12170. TNS-12500/ORA-12500: TNS: listener failed to start a dedicated server process; Cause: The listener failed. All, I'm getting this error in sqlnet.log file. Fatal NI connect error 12547, connecting to: (DESCRIPTION=3D(LOCAL=3Dno)(ADDRESS. Oracle error tips: Connecting to a hung database with the -prelim option - 29 March 2014 fatal ni connect error 12170 Tips - 7 November 2015.

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Fatal ni connect error 12500
Fatal ni connect error 12500
Fatal ni connect error 12500
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131561 - Work processes sometimes abend during database


After that, restart the Listener.

2. Up to Oracle 8.1, there is the possibility on UNIX to create shadow processes in advance, so that during the connection no time is required for creating fatal ni connect error 12500 and thus the single connection setup becomes faster, fatal ni connect error 12500. This can be configured via the parameter PRESPAWN in listener.ora. In the following example, 20 advance shadow processes are defined for incoming IPC connections: SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (SID_NAME = ) (ORACLE_HOME = ) (PRESPAWN_MAX = 20 ) (PRESPAWN_LIST= (PRESPAWN_DESC = (PROTOCOL = IPC ) (POOL_SIZE = 20 ) (TIMEOUT = 1 ) ) ) ) )

After that, restart the Listener.

For more details please observe the Oracle documentation. fatal ni connect error 12500. Another reason for the connect problems can be an activated Oracle trace (please see note 92537). Note 381105 also describes possible solutions.

4. On TRU64, sporadic abends with ORA-01034 may also be triggered by a false operating system parameterization. So please check note 356370. Specifically vm/new_wire_method must be set to 0.

On HP-UX, the maximum queue length on TCP level is defined by the parameter tcp_conn_request_max, which must be enlarged if necessary.

If you have questions about the operating system side restrictions of the queue length depending on the used protocol, please contact your hardware partner.

5. If the problem occurs when several SAP instances are started concurrently, the situation can also be improved by starting the instances with a slight time offset.

Other Attributes


This document is not restricted to a software component or software component version


This document refers to:

SAP Notes


1685664 MDM Client hangs due to DBMS connection errors 609332 Composite note: ORA-12541/ORA-12224 513524 Composite ORA-12540 SAP note 505630 Composite SAP Note ORA-12547 445029 ORA-12203 composite SAP note 437362 Composite error opening /dev/ttys0 oscam ORA-12500 381105 ORA-12203 / ORA-12535 when starting the R/3 work processes 356370 Kernel parameters for HP Tru64 UNIX 5.x

92537 Oracle trace is automatically active 34479 Collective note for problems with SQL-Net V2 ORACLE

Database System

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