[GENERAL] error connecting to database

[Alexander Cohen]

Im trying to connect locally to a database on a running postgres 
cluster. If i connect with psql, everything is fine and i can transact. 
I i try and connect in my own app, i get this error:

Could not connect to server: permission denied.
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"
I know for a fact postgres is running, i can see with <ps> and also 
<top> in the terminal on Mac OSX 10.3.5.

What exctly does this error message mean? What permissions is this 
error talking about?

Alex
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