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Knowledge document #3495

Web browser reports that connection to FRITZ!Box is not safe

When you try to open the FRITZ!Box user interface with MyFRITZ!App, the web browser displays one of the following messages:

  • "Your connection is not private" (Google Chrome)
  • “Your connection is not private” (Microsoft Edge)
  • "This connection is not secure" (Mozilla Firefox)
  • "This Connection is Not Private" (Apple Safari)

The messages are either displayed in the web browser's address bar or in the web browser itself. Note the information given in the corresponding section.

1 Web browser shows a non-encrypted connection

If the web browser describes the connection to the FRITZ!Box as "Not secure" in the address bar or displays a lock with a red line through it :

Chrome message "Not secure"

The web browser indicates that connections to websites that are not or are only partially encrypted are not secure because data entered on such websites can be stolen by a third party. You can ignore this message because the FRITZ!Box user interface is opened within your home network and no data is sent over the internet.

2 Web browser warns about unknown security certificate

If the web browser displays a certificate warning instead of the FRITZ!Box user interface:

Chrome message "Your connection is not private"

When establishing an encrypted HTTPS connection, the web browser checks the website's security certificate. Since the FRITZ!Box's individual security certificate is not known to third party organizations that issue such certificates, the web browser indicates that the HTTPS connection to the FRITZ!Box is not secure.

To avoid having the browser display the certificate warming, you can use a certificate from letsencrypt.org:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click on "MyFRITZ! Account" in the "Internet" menu.
  3. Enable the option "Use certificate from letsencrypt.org (recommended)"
  4. Click "Apply" to save the settings.
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