I tried to import a MySQL dump into my WHM phpmyadmin tonight and it's caused all of the sites on my server to fail at connecting to their databases, so they're all down. The databases imported but have no tables in them, it didn't seem to have overwritten any of the existing tables as those all still have their data. There doesn't seem to be anything in the error log but this: cphulkd rejected registration attempt for cpaneld with: 400 Unable to connect to database backend: Failed to connect to mysql db: cphulkd I've checked my.cnf and it just had this: [mysqld] innodb_file_per_table=1 So I stopped MySQL and changed it to this: [mysqld] port=3306 socket=/tmp/mysql.sock innodb_file_per_table=1 [client] port=3306 socket=/tmp/mysql.sock Started MySQL and still the same. I'm running a graceful server reboot now, if anyone has a clue what else I could try please help me. Already put through a paid support ticket on #2720998. UPDATE: Graceful reboot didn't help. UPDATE: Running MySQL 5.1, should I update to 5.5? It's possible the import came from a 5.5 installation but I can't verify that.