TYPO3 Exception 1518448686 

No suitable request handler found 

The following exception may be displayed since TYPO3 v9 during login:

#1518448686 TYPO3\CMS\Core\Exception
No suitable request handler found.
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Reasons 

The password for installation tool is missing in LocalConfiguration.php. TYPO3 tries to find out the encryption type by analyzing the password in order to allow logins after migrating to an other encrypting algorithm.

Solutions 

See Recovering from a corrupt or missing install tool password.