Upgrade to 2.2.17 ok. to 2.3.4 fails + Forbidden (solution)

[TheLaw]

Hope this helps others trying to upgrade from 2.2.x to 2.3.x.

First warning. You may want to upgrade sucessfully to 2.2.17 and then take a backup/snapshot of your entire server first. If you try to go to 2.3.x you may end up with errors as it seems to work differently than 2.2.x with regard to security. This is what I eventually did.

I upgraded from 2.2.16 to 2.2.17 flawlessly. All addons off. Style off and set to default. Make sure to replace your existing .htaccess using the default...

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Upgrade to 2.2.17 ok. to 2.3.4 fails + Forbidden (solution)

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