There are two configuration file interface/lib/config.inc.php server/lib/config.inc.php I changed the primary servers mysql port, rather than doing an upgrade to reconfigure I opted to change the configuration "file" instead. Took me a little while to work out why cron.log was showing connection errors and so changing the second file. With a brief inspection the files have the same size and appear to contain the same content. Actually diff shows they are identical. Is there a reason to keep two files in this way. Possibly some usage that I am not yet aware of?