I revised and backed up my client's site yesterday without any issues. As soon as I clicked the update Wordpress button the new install started then a few seconds later the following popped up on a new browser : Updated around 12am Sunday 21817. Site went into immediate http 500 error. I tried to log into the wordpress wp-admin page and the admin page said that the username was invalid. I'm not sure if the site is in maintenance or is it just nowhere to found anymore within the server. Everytime i type in the website the following comes up. The website isnt working. The website is currently unable to handle this request. HTTP ERROR 500 WP version before update 4.6.3 The site hadn't been updated in over 2 years.
closed as off-topic by Michael, Dave Romsey, cjbj, bueltge, Howdy_McGee♦ Feb 21 '17 at 22:24
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions that are too localized (such as syntax errors, code with restricted access, hacked sites, hosting or support issues) are not in scope. See how do I ask a good question?" – Michael, Dave Romsey, cjbj, bueltge, Howdy_McGee
Restore your old Wordpress install, then try updating again. Some error might have occurred while upgrading, causing the site/DB to be inaccessible. If the error persist, then you might need to do a manual update of Wordpress.