Can't connect to Postgresql Database

[ifreak]

Hello,
i'm running a PSQL Database on server 1 (ip 1.0.0.1). (PSQL Version psql (PostgreSQL) 12.6 (Debian 12.6-1.pgdg100+1))
I try to connect to this Database from mantis server 2 (ip 1.0.0.2)

ip's only samples

Database is created and owner is set to "mantis"
also command

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GRANT ALL PRIVILEGES ON DATABASE mantis TO mantis;

was executed...

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                             List of databases
   Name    |  Owner   | Encoding  | Collate | Ctype |   Access privileges   
-----------+----------+-----------+---------+-------+-----------------------
 mantis    | mantis   | SQL_ASCII | C       | C     | =Tc/mantis           +
           |          |           |         |       | mantis=CTc/mantis

postgresql.conf is adaptet with

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listen_addresses = '*'

pghba.conf is also configured with

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host    mantis          mantis          1.0.0.2/32         trust

on server 2 i can connect the database via terminal with the following command and entering the password

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psql -h 1.0.0.1 mantis mantis

mantis install.php tell me

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Attempting to connect to database as admin	BAD
Does administrative user have access to the database? ( Database connection failed )

can anybody help me?