TYPO3 Exception 1389265900¶
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You are not allowed to access the backend as your IP does not matches the [BE][IPmaskList] setting in the Install Tool.¶
Go to the Install Tool and add your IP address in All Configuration
['BE']['IPmaskList'], using comma separation (no semicolon).
See also https://docs.typo3.org/typo3cms/SecurityGuide/GuidelinesIntegrators/GlobalTYPO3Options/Index.html#ipmasklist for more security advice.