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Re: installation mysql
When you start OU the run script performs a number of environmental checks before it starts the server proper. One of those checks is to make sure that MySQL is running and that its accessible. That checks failing here. What it actually does is to try and open a connection on the standard MySQL port (3306) and execute a test query.
The first thing I would do is to check that you do have MySQL installed and running and, if it is, confirm which port it is listening to.