FRITZ!Box 3370 – Service - Knowledge Base

FRITZ!Box 3370 – Service

Error message "Internal communication error (login -1). Exiting" when opening user interface

The FRITZ!Box user interface cannot be opened. After entering entering fritz.box in the address field of the web browser, the error message "Internal communication error (login -1)" is displayed.

Simply proceed as described below. After each measure, check whether the issue persists.

1 Restarting the FRITZ!Box

  1. Unplug your FRITZ!Box by removing the power cable from the electrical outlet.
  2. Plug it in again after 5 seconds.

    Note:The FRITZ!Box settings will not be deleted when it restarts. The restart will take about 2 minutes. During this time, you cannot access the FRITZ!Box user interface.

2 Resetting the FRITZ!Box