Happy New Year everyone! Mine started out well… suddenly, without a deployment or Azure issues, a website went completely unresponsive. “502 – Web server received an invalid response while acting as a gateway or proxy server”
Looking at the change log there was a content change just before the site went down. The change made was that a shortcut was set on page_1 to page_2, while page_2 had a shortcut to page_1. So an endless loop was created.
Episerver validates if the shortcut is set to “self”, but not for this scenario. So I created a validator that checks if the shortcut references a page that is a shortcut itself. You can find it here.
EPiServer Development 
Have you reported this as a bug?
Ths bug existed for a long time in CMS 6 and I made a fix for it then.
Kinda sucks that it has come back.
But nice fix!
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Dunno if it’s a bug. Probably not often that editors create a loop like this
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