TNS-12547 and TNS-12555 troubleshooting

Oracle boot listening errors I. TNS-12547: TNS-12547: TNS: lostcontactTNS-12560: TNS: protocoladaptererrorTNS-00517: Lost

Oracle boot listening errors I. TNS-12547: TNS-12547: TNS: lost contactTNS-12560: TNS: protocol adapter errorTNS-00517: Lost

Resolving Oracle listener startup errors

1, TNS-12547:

TNS-12547: TNS: lost contact
TNS-12560: TNS: protocol adapter error
TNS-00517: Lost contact
Linux Error: 104: Connection reset by peer

No 127.0.0.1 localhost is found in/etc/hosts.

Modify/etc/hosts as follows:
$ Cat/etc/hosts
# Do not remove the following line, or various programs
# That require network functionality will fail.
127.0.0.1 localhost

2, TNS-12555:

TNS-12555: TNS: permission denied
TNS-12560: TNS: protocol adapter error
TNS-00525: Insufficient privilege for operation
Linux Error: 1: Operation not permitted

The solution is as follows:

# Chmod 777/var/tmp/. oracle

Cause analysis: the/var/tmp/. Oracle directory permission is insufficient because the oracle directory is not clean. Therefore, an error is returned.

Related reading:

Oracle TNS-04415 Error

Oracle 10g RAC listener reports TNS-12545 TNS-12560 TNS-00515

Oracle 11gR2 RAC TNS-12542: TNS: address already in use fault case

TORA-12154 and TNS-03505: unable to resolve name

Encounter TNS-01150: The address of the specified listener name is incorrect

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