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Those errors are very common errors. I have this error one of our EBS r12 instance
While I try to start my listener, I have errors, such as:
[oraprod@oracle]$ lsnrctl start LISTENER TNS-12541: TNS:no listener TNS-12560: TNS:protocol adapter error TNS-00511: No listener Linux Error: 111: Connection refused
I noticed that I have a missing entry on my /etc/hosts file as:
127.0.0.1 localhost.localdomain localhost
After adding this line than I can start & stop listener without any problems.
Similar issue investigated in MOS [ID343295.1]
Helios's Blog 