update-core.php throws 404

  • Since updating to 4.2, I am getting a 404 when I try to update my theme and Jetpack (on update-core.php). Strangely, updating the themes that came from wordpress, twenty-fifteen, etc. there were no issues. I looked at a bunch of different threads but they were either old or had too many options in them. Please advise.

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  • I had a similar problem today (page not found on update-core.php) trying to auto-install 4.2.1 using Firefox. Switching to Chromium (I use Ubuntu) solved it for me. Note that before the switch I also deactivated all WP plugins. Also note that my Firefox is loaded with many add-ons, while my Chromium is completely bare.

    HTH,
    Ger

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