I'm not sure how i did it. I changed /etc/mysql/my.conf add this Code: innodb_large_prefix=true innodb_file_format=barracuda innodb_file_per_table=true restartet mysql. After that the whole mail system does'nt work anymore. I checked this files and the passwords are the same. I run the ispconfig update.php script. And i copied "samepassxxx" with myphpadmin to the usertable für mysql, but the password is shorter than the others. Code: /usr/local/ispconfig/server/lib/config.inc.php //** Database $conf['db_type'] = 'mysql'; $conf['db_host'] = 'localhost'; $conf['db_database'] = 'dbispconfig'; $conf['db_user'] = 'ispconfig'; $conf['db_password'] = 'samepassxxx'; $conf['db_charset'] = 'utf8'; // same charset as html-charset - (HTML --> MYSQL: "utf-8" --> "utf8", "iso-8859-1" --> "latin1") $conf['db_new_link'] = false; $conf['db_client_flags'] = 0; cat /etc/postfix/mysql-virtual_domains.cf user = ispconfig password = samepassxxx dbname = dbispconfig And thins not connect with the mailsystem. Any ideas how to fix that?