Logging into the Joomla backend does not work and similar warnings like the following will appear on your start page:
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/login/configuration.php:1) in /home/login/libraries/joomla/session/session.php on line 423
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/login/configuration.php:1) in /home/login/libraries/joomla/session/session.php on line 423
Warning: Cannot modify header information - headers already sent by (output started at /home/login/configuration.php:1) in /home/login/libraries/joomla/session/session.php on line 426
A byte order mark (BOM) at the beginning of the configuration.php file. It has been edited with an unsuitable editor. However, any other file that is executed before the session can also be used. Finding the BOM is particularly problematic because it is a defined marker byte and is not shown either in the editor or in the browser. It is not visible except in a hex editor.
Windows Notepad, for example, is unsuitable for editing UTF-8 files for the web, because it inserts the BOM unsolicited, even if the open file did not have a BOM before.
A suitable editor is e.g. Notepad++. Here you can convert the file to "UTF-8 without BOM".
In one of the files executed first, there is a space or line break outside of "< ?php" and "? >". This error is quick and easy to find. Simply delete the line break or the Space out.
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