New server with MySQL 5.5.27 , creating users on new virtual servers fails

Hello,

I've just installed a new server with MySQL 5.5.27. When I try to restore a Virtualserver backup from another server, or when I try to create a new virtual server I get an error:

Creating MySQL login ..
.. MySQL database failed! : SQL insert into user (host, user, password) values ('%', 'xxxxxxx', password('Hf12HLKYCfcrXEfL')) failed : Field 'ssl_cipher' doesn't have a default value at /usr/libexec/webmin/web-lib-funcs.pl line 1360.

Here's MySQL my.cnf file, generated on https://tools.percona.com/

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
 
 
# Generated by Percona Configuration Wizard (http://tools.percona.com/) version REL5-20120208
# Configuration name linux07 generated for rogerio.brito@intercode.com.br at 2012-08-29 15:29:21
 
[mysql]
 
# CLIENT #
port                           = 3306
socket                         = /var/lib/mysql/mysql.sock
 
[mysqld]
 
# GENERAL #
user                           = mysql
default_storage_engine         = InnoDB
socket                         = /var/lib/mysql/mysql.sock
pid_file                       = /var/lib/mysql/mysql.pid
 
# CONFIGURACOES ORIGINAIS
symbolic-links=0
thread_concurrency = 8
myisam_sort_buffer_size = 64M
read_rnd_buffer_size = 8M
read_buffer_size = 2M
sort_buffer_size = 2M
table_cache = 512
key_buffer = 384M
 
# MyISAM #
key_buffer_size                = 32M
myisam_recover                 = FORCE,BACKUP
 
# SAFETY #
max_allowed_packet             = 16M
max_connect_errors             = 1000000
sql_mode                       = STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ONLY_FULL_GROUP_BY
sysdate_is_now                 = 1
 
# DATA STORAGE #
datadir                        = /var/lib/mysql/
 
# BINARY LOGGING #
log_bin                        = /var/lib/mysql/mysql-bin
expire_logs_days               = 14
sync_binlog                    = 1
 
# CACHES AND LIMITS #
tmp_table_size                 = 32M
max_heap_table_size            = 32M
query_cache_type               = 0
query_cache_size               = 32M
max_connections                = 500
thread_cache_size              = 50
open_files_limit               = 65535
table_definition_cache         = 4096
table_open_cache               = 4096
 
# INNODB #
innodb_flush_method            = O_DIRECT
innodb_log_files_in_group      = 2
innodb_log_file_size           = 256M
innodb_flush_log_at_trx_commit = 1
innodb_file_per_table          = 1
innodb_buffer_pool_size        = 6G
 
# LOGGING #
log_error                      = /var/lib/mysql/mysql-error.log
log_queries_not_using_indexes  = 1
slow_query_log                 = 1
slow_query_log_file            = /var/lib/mysql/mysql-slow.log

What can I do? Thank you

• Rogerio