WordPress is a great CMS but when it comes to debugging and error reporting it becomes pretty annoying. I've been searching a solution for my problem for quiet a while now. Unfortunately without any success or any clues. At some point you just get stuck and start typing a stackexchange question, like I'm doing now...
I can't upgrade or update from WordPress, however I'm able to upload media. Of course I want to be able to update plugins, themes and upgrade the core from the WordPress admin panel. Said shortly, I want to be able to use the FS_method direct.
In case of a upgrade it returns:
Could not create directory.: wordpress
In case of a update it returns:
An error occurred while updating Example: Could not create directory. example
My server uses nginx and I tried chmod everything in the WP install to 775 and I also tried 777. Except the 'example/test' directory (755) and the 'example/index.php' file (644). I've a configuration file similar to this paste. I also tried to change the tmp folder to a local directory with perms set to 777.
Since WordPress says that it's not able to create a directory (permission related). I decided to do a simple permission test, using this code, with this is the result. In this test I use
is_writable() to check the permissions, the red file names are not writable.
The file with the script (permtest.php) was located at the wp root location aka doc root. I also tried to put the script in a separate directory (example/index.php is the same script) here is the result for that second test.