FTP Problem, backend error lost connection to database

    Hello,


    I have a problem with FTP server on a i-mscp 1.1.2. The error below appears when I try to make a transaction, apparently only if I delete files in any folder on the server. Any suggestions? Thanks!


    Code
    1. Mar 12 09:18:09 csrv9 proftpd[15612]: 192.168.1.15 (89.47.55.22[89.47.55.22]) - mod_sql/4.3: unrecoverable backend error: (mod_sql_mysql/4.0.8) lost connection to database
    2. Mar 12 09:18:09 csrv9 proftpd[15612]: 192.168.1.15 (89.47.55.22[89.47.55.22]) - mod_sql/4.3: check the SQLLogFile for more details
    3. Mar 12 09:18:09 csrv9 proftpd[15612]: 192.168.1.15 (89.47.55.22[89.47.55.22]) - FTP session closed.

    Nothing in there. I have found out the source of the problem. To be more exactly, was one of my optimized my.cnf. By mysqltuner and other applications everything is OK, apparently proftpd does not like something... With the default conf everything is OK>