Postgres v9.5.3 and v9.5.4 Unix Socket Issue

>
> psql (client rpm in 9.5) is not consistent with build default of 9.5
> server rpm. Is that a possibility????
>

I suppose - but to verify it looks like your connection syntax is not
really compatible with the socket style, docs say you should pass socket
path with to the -h or --host - maybe pass your socket in as:

h hostname
--host=hostname

Specifies the host name of the machine on which the server is running. If
the value begins with a slash, it is used as the directory for the
Unix-domain socket.

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