Going to mydomain.com/wp-admin/ gives this warning on debug-mode:
Warning: Cannot modify header information - headers already sent by (output started at /home/mypage/public_html/wp-config.php:1) in /home/mypage/public_html/wp-includes/pluggable.php on line 876
and nothing if debug-mode is off.
So far I have read quite many similar posts but nothing has helped or I have done something wrong. Nevertheless here is a list of things I have tried:
- checked whitespace before and after php-tags in many files (config, functions, login, pluggable, ...)
- disable plugins via database / removed plugins from ftp
- removed old files and uploaded fresh copy of wordpress
- tried default theme
Most common problem in general has been the whitespace and I have been trying to track it down but so far no help. If someone has more detailed knowledge why such a warning is shown, I would gladly hear about it (I am not a pro).
In addition I have not made any changes before this problem occured. One captcha plugin stopped working I was going to update / change it and then this happened.