If you encounter TNS-12518: TNS:listener could not hand off client connection error, this article may help you.

Error messages

# Connect with sqlplus
[oracle]$ sqlplus system/orasystem12345@//oralab01:1521/UXODB

    SQL*Plus: Release 12.1.0.2.0 Production on Sat Oct 31 10:48:32 2015

    Copyright (c) 1982, 2014, Oracle.  All rights reserved.

    ERROR:
    ORA-12537: TNS:connection closed

# Check listener log for more detail
[oracle]$ vi $ORACLE_BASE/diag/tnslsnr/${HOSTNAME%%.*}/listener/trace/listener.log
    ...
    31-OCT-2015 10:48:32 * (CONNECT_DATA=(SERVICE_NAME=UXODB)(CID=(PROGRAM=sqlplus)(HOST=oralab01.uxora.com)(USER=grid))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.0.40)(PORT=47838)) * establish * UXODB * 12518
    TNS-12518: TNS:listener could not hand off client connection
     TNS-12547: TNS:lost contact
      TNS-12560: TNS:protocol adapter error
       TNS-00517: Lost contact
        Linux Error: 32: Broken pipe
    ...

Or from a jdbc connexion, you may have the following error message:

IO Error: Got minus one from a read call.

Solution

oracle executable may miss the suid sticky bit. It may have been removed because of a wrong command or a wrong script.
Set it back s follow:

# Check oracle executable binary
[oracle]$ ls -l $ORACLE_HOME/bin/oracle
    -rwxr-s--x. 1 oracle asmadmin 210720059 Oct 19 02:11 /u01/app/oracle/product/11.2.0/db_1/bin/oracle

# Set the sud sticky bit
[oracle]$ chmod 6751 $ORACLE_HOME/bin/oracle

# Check again oracle binary
[oracle]$ ls -l $ORACLE_HOME/bin/oracle
    -rwsr-s--x. 1 oracle asmadmin 210720059 Oct 19 02:11 /u01/app/oracle/product/11.2.0/db_1/bin/oracle

 

HTH.
Please leave comments and suggestions,
Michel.

Reference
What is SUID and how to set SUID in Linux/Unix? (linuxnix.com)

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Jamel FARISSI
# too goodJamel FARISSI 2016-08-30 15:57
hello,

just to say many many thanks.

Kind regards.
Reply | Reply with quote | Quote