Re: Phppgadmin

>            // Hostname or IP address for server.  Use '' for UNIX domain
> socket.
>        $conf['servers'][0]['host'] = '';

There you're trying to use "socket" connection (which corresponds to
"local" in pg_hba.conf:

> # "local" is for Unix domain socket connections only
> local   all         all                               ident sameuser

> #local   all        all                                 md5
> # IPv4 local connections:
> host    all         all         127.0.0.1/32          md5
> host    all         all         192.168.1.0/24        trust
> #host   all         all         192.168.1.0/24          password
> # IPv6 local connections:
> host    all         all         ::1/128               md5

Suggestion: try changing your phppgadmin configuration with
$conf['servers'][0]['host'] = 'localhost'; (to connect via TCP/IP), or
your pg_hba configuration for md5 or your preferred auth method on
local sockets...