I have a WP multisite that I am no longer able to run core updates via the admin dashboard. It used to work just fine back in the WP 4.* days, but stopped working the last couple of updates and the last time I updated to the version I am on now I had to do it manually by replacing the core files. I can update plugins and themes no problem, it's just core that gives me an error:
I have checked and double checked all the file permissions and file ownership and everything looks good to me. All directories are 755, and files are 644 except for the wp-config file which is 640.
Right now I don't have access to the error logs on the server but am working on getting access.
Because the file permissions and ownership looks good, what else can I look at?
I can update the manual way, just prefer to use the GUI because of our workflow. Everything is in git, and we have a duplicated verification instance that we run updates on before doing the same thing on our main production environment, so to be honest its just easier and cleaner in our git to do this via the GUI.
As I said, core update used to work fine via the admin dashboard, and I haven't changed anything regarding permissions or ownership. I don't know if something changed on the server or not, but I don't think so.
I also looked through the similar posts on here and couldn't find anything that helped me solve this.
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