Internal server errors (error 500) are often caused by plugin or theme function conflicts, so if you have access to your admin panel, try deactivating all plugins. If you don’t have access to your admin panel, try manually resetting your plugins (no Dashboard access required). If that resolves the issue, reactivate each one individually until you find the cause.
If that does not resolve the issue, try switching to the Twenty Fifteen theme to rule-out a theme-specific issue. If you don’t have access to your admin panel, access your server via FTP or SFTP, navigate to /wp-content/themes/
and rename the directory of your currently active theme. This will force the default theme to activate and hopefully rule-out a theme-specific issue.
If that does not resolve the issue, it’s possible that a .htaccess
rule could be the source of the problem. To check for this, access your server via FTP or SFTP and rename the .htaccess
file. If you can’t find a .htaccess
file, make sure that you have set your FTP or SFTP client to view invisible files. Better go to Settings >> Permalinks and hit Save Changes button. It will regenerate your .htaccess
file.
Hope this helps you.