FRITZ!Box 7330 – Service - Knowledge Base

FRITZ!Box 7330 – Service

FRITZ!Box reports "Internal system error (17) occurred" when adding a Google calendar

When setting up automatic switching for a smart home device, FRITZ!DECT, or FRITZ!Powerline, you cannot add a Google calendar. During the authentication process, the error message "The authentication process for the Google Calendar on the FRITZ!Box could not complete the procedure successfully. Internal system error (17) occurred" is displayed.


  • Either a calendar has not been created yet or the name of the calendar contains illegal characters or is misspelled.

1 Creating a calendar

The following step is only necessary if you have not created a Google calendar yet:

2 Correcting the name of calendar and adding it

The following step is only necessary if you have already created a Google calendar:

Correcting the name of calendar

  1. Log into your Google account.
  2. Rename the calendar you would like to use for the smart home device: Remove all special characters, spaces, letters with umlauts, or accented letters from the calendar's name. The name may only contain standard Latin letters and numbers.

Adding a calendar