Under some circumstances, a listener may fail to start with the following error.
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused
Solution may be to set the LD_BIND_NOW variable to 1.
Then optionally to restart the EMCC agent with that parameter set, if the error occured during an agent-base software deployment. Preferably undo this change once the EMCC job has completed, as this parameter may have side effects on other EMCC jobs.