How to configure pgmodeler? I am having some troubles configuring pgmodeler, particularly the Connections.

I put 


  Connection DB: postgres
  
  Host/Port      localhost           5432
  
  User           postgres
  
  Passwort


Could not connect to the database. Message returned: could not connect to server: No route to host Is the server running on host "5432" (0.0.21.56) and accepting TCP/IP connections on port 5432?

I think there is something wrong with my idea. However, I just looked for the required information on the first page of pgadmin after logging into. Can someone explain me how to get the connection from pgmodeler to my postgres DB?
I had ran into this problem and solved changing pg_hba.conf in this line

local    all            postgres        password
# IPv4 local connections:
host    all             all             127.0.0.1/32            password
# IPv6 local connections:
host    all             all             ::1/128                 password


changed the word ident to password. 
It worked for me!