The forum server was down for ~45 minutes just now because I had to run checks on the MySQL database and take a fresh backup for replication.
The reason for this is that sometime earlier this weekend the forum server rebooted itself uncleanly, which may potentially have caused database problems and certainly did break replication (the database is replicated in realtime to another server which is used mainly for backups, a process that would normally cause the database to freeze for several minutes every time a backup is made... which is something you'd want to do daily at least).
As far as I can see there do not appear to have been any major problems caused by the unclean reboot.
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