[rsHealthPoll] couldn't connect to xxxxx.local:27017: couldn't connect to server xxxxxx.local:27017

I received following error on mongod.log file of every server of replicaset

[rsHealthPoll] couldn't connect to xxxxx.local:27017: couldn't connect to server xxxxxx.local:27017

When I checked, I discovered one of the arbiter server was not running i.e. mongod process was not running on arbiter server.

Solution: Start the mongod process with either of following command

service mongod start

or

/etc/init.d/mongod start

Once mongod process was started, every server in the replicaset were connected successfully to this arbiter server.