Hello,
I am having some issues with accessing my site.
Everything was running perfectly until 3 days ago when my hosting provider installed an SSL certificate.
It failed the first time so they changed IP.
However, ever since this now my site has got some serious issues/errors and i cannot access anything. This is causing serious downtime.
When i attempt to go to the homepage, there is just a blank white screen?
When i attempt to login to the admin i get the following error: Fatal error: Call to undefined function nocache_headers() in ... /wp-admin/admin.php on line 33
I have contacted my hosting provider and they are useless to say the least. They have no idea how to fix the issue and have tried adding new .htaccess files and still nothing.
I did some hunting around online and on forums and all methods do not work. I have tried upgrading wordpress. Creating a new WP-Config.php file. Deactivating plugins etc etc. Still nothing.
I have a multisite setup currently.
I am at a total loss as to what to do now?
Any advice would be much appreciated.
I have access to FTP etc.
