WebDAV – Cannot Access Folder: The Parameter is incorrect

I’ve just had an issue where we lost the ability to access a webDAV folder on our server. Windows explorer kept saying
“Cannot Access Folder. The parameter is incorrect”.
After checking permissions which had no problems I then found that my developer had uploaded a backup of a web app to the server. And in one of the sub-folders was a file named index.php. As our web server is set to show index.php files I believe this was the cause of the problem. As it was trying to render the page. So renaming the file to index.php.bak solved the problem.

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