Recently I couldn’t access the backend with my Typo3 4.5.5. First off I thought I forgot my password but because I’ve physical access to my database I can verify that. I can access the install tool and create me a new user but to no avail. I’ve updated my typo3 version to 4.6.8 to no avail. I can use Typo3 4.7.0 but some of my extensions needs a workaround because it doesn’t work with 4.7.0. What can be the reason my user cannot access the backend? I don’t have any php error in the logs. For developement I’m using a virtual machine with Suse 12.2 and lighttpd + FastCGI, php 5.3.8, xdebug 2.2.0RC2 and Komodo IDE. Mysql is from suse repository so it’s something 5+.
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Perhpas you activated the rsaauth Extension and you are having some special characters in your password? Try to change it to an simple ANSI-only password for testing purpose.
Perhaps try to delete related cookies or use an fresh/different browser.
Check your settings in INSTALL-Tool, perhaps you locked your Session to a wrong domain / IP?