That's because in your code at some place you have specified localhost
instead of the ip address of the machine running the service. When run it in
local mode it will work fine because everything happens on that machine and
hence it will be able to connect to localhost which runs the service, now on
the cluster mode, when you specify localhost, those workers will connect to
their localhost (which doesn't have that service running), So Instead of
localhost you can specify the ip address (either internal or public) of that
machine running that service.
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