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The ssh daemon output an error "Bind to port 22 on xxxx:xxxx:xxxx:xxxx::xxx failed: Address already in use" on starting it

Solution Unverified - Updated 2015-01-21T02:04:16+00:00 -

Issue

The ssh daemon output the following error into /var/log/secure on starting it.

Dec 10 14:32:27 testmachine sshd[2638]: error: Bind to port 22 on xxxx:xxxx:xxxx:xxxx::xxx failed: Address already in use.

We have a ListenAddress configuration in /etc/ssh/sshd_config as below.

ListenAddress testmachine
ListenAddress testmachine.ipv6

Also, we have the following entries in /etc/hosts

192.168.100.1  testmachine testmachine.ipv4
xxxx:xxxx:xxxx:xxxx::xxx  testmachine testmachine.ipv6

Environment

Red Hat Enterprise Linux 6

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