Red Hat ENTERPRISE LINUX AS 2.1 - Installationsanleitung PDF herunterladen (Seite 119)

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ORA-12547: TNS:lost contact

There can be many reasons for this error. This can happen during the ASM instance start up when the

libaio RPM is not installed on the system.

You can test this by running lsnrctl as the oracle user.

$ lsnrctl start

...

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC)))

TNS-12547: TNS:lost contact

TNS-12560: TNS:protocol adapter error

TNS-00517: Lost contact

Linux Error: 104: Connection reset by peeras

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=centauri)(PORT=1521)))

TNS-12547: TNS:lost contact

TNS-12560: TNS:protocol adapter error

TNS-00517: Lost contact

Linux Error: 104: Connection reset by peer

Make sure the loopback entry in /etc/hosts is not missing when you start the listener:

127.0.0.1 localhost.localdomain localhost

Now try to run lsnrctl as the user oracle again.

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Red Hat ENTERPRISE LINUX AS 2.1 - Installationsanleitung Seite 119