I've just upgraded to WordPress 5, and all is working fine on the main site.

However on the two sub-branch sites, when I try to create a new post, I receive a white screen and the console reports 404 errors when trying to retrieve the following files:


The files are definitely there, all other files are being retrieved correctly from the same and similar locations.

There are no bugs reported in the debug file, I have reset permalinks and have tried deactivating all plugins.

Does anyone kindly have any suggestions?

If my question isn't welcome, it would be appreciated if it isn't downvoted - Stack Overflow is allegedly trying to become more welcoming - it seems this page hasn't caught on yet.

1 Answer 1


The error was caused by a rewrite rule in our web.config file:

<rule name="API" stopProcessing="true">
    <match url="API" />
    <conditions logicalGrouping="MatchAll" trackAllCaptures="false" />

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