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I believe it is scheduled server shutdown for maintenance starting at 1100 BST and lasting 3 hours or so.
Exactly this.
~~~~ Just another victim of the ambient morality ~~~~
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Imagine having a homepage to post this stuff on but using an external site instead
It was specifically called out in yesterday's update newspost:
Maintenance activities that are ongoing are also always on Jagex's Support Centre, there is a banner along the top of it indicating the maintenance. It isn't only advertised on external sites.
Thank you, ApplejuiceAJ. I missed that notice, while skipping through the patch notes yesterday. Like the OP I always come here to the "Updates" Forum first, when there is a count down like this morning. Panicked at first, but all is now well.