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We were doing a needed OS upgrade and were up for a bit, but we've gone down again. Too many things were having issues with upgrading to php7 (which was needed as Ubuntu 16.04 LTS doesn't play with php5). I am just downloading a db backup (10GB) and and then will be restoring to the previous version and then restoring the database. We'll leave the OS update to happen when we update vBulletin (on the roadmap for later this year)
We will be back soon...