Why is it impossible to log in with phpPgAdmin?

Question

PostgreSQL

Good afternoon, I installed postgresql 9.4 and phppgadmin for administration on the server, as a result, after all the settings, I can’t log in to phppgadmin, although I can use the ssh console.
When authorizing through phppgadmin, it writes an incorrect login. What could be the problem?

Answer 1

sudo -u postgres psql
         ..... ALTER USER postgres WITH PASSWORD '.....';

By default, authorization is through the operating system, and there is no user in the database.