I am not sure why, but the back-end of my site is running slow... even though it's running slow, all pages still load, except this one /wp-admin/plugin-install.php (the add new plugin page).

I checked and the file is present in wp-admin, with the correct permissions, every time I try to load the page I get a 404.

Does anyone have a clue what's going on?

  • In my case, it started after enabling ssl on wordpress 4.7.3. – SePröbläm Apr 5 '17 at 14:31

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