I decided compare engines MyBB, phpBB and SMF.
MyBB and phpBB where installed whithout problems. But SMF 2.0 has an error on second step of installation.
Cannot connect to the database server with the supplied data.
If you are not sure about what to type in, please contact your host.
All setting like "Server name", "username" and so on where checked many times and are absolutely correct. There wasn't any connection indeed. PostgreSQL debug logs show me absence of connection attempts. I suppose it's an engine proplem
My server configuration:
PHP use pgsql (not pdo_psql) extention.
PostgreSQL(libpq) Version 8.1.18