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 Fourteen 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.
If you weren’t able to resolve the issue by either resetting your plugins and theme or renaming your .htaccess file, we may be able to help, but we’ll need a more detailed error message. Internal server errors are usually described in more detail in the server error log. If you have access to your server error log, generate the error again, note the date and time, then immediately check your server error log for any errors that occurred during that time period. If you don’t have access to your server error log, ask your hosting provider to look for you.
Hi, I have done all the steps you comment and does not work,
I have the same problem
Internal Server Error – Cannot manage plugins and updates
the log file shows me that every time I try to activate plugins
[Mon Sep 07 21:42:07 2015] [error] [client 84.236.167.201:63522] – http://www.acequiamayor.com – End of script output before headers: plugins.php, referer http://www.acequiamayor.com/wp/wp-admin/
[Mon Sep 07 21:41:49 2015] [error] [client 84.236.167.201:63477] – http://www.acequiamayor.com – End of script output before headers: admin-ajax.php, referer http://www.acequiamayor.com/wp/wp-admin/
Hope you can help me. Thank you in advance.
oscarmica, Try downloading WordPress again and delete then replace your copies of everything except the wp-config.php file and the /wp-content/ directory with fresh copies from the download. This will effectively replace all of your core files without damaging your content and settings. Some uploaders tend to be unreliable when overwriting files, so don’t forget to delete the original files before replacing them.
If that doesn’t work for you, please open your own thread: https://ww.wp.xz.cn/support/forum/how-to-and-troubleshooting#postform
