FRITZ!Box 7340 Service - Knowledge Base

FRITZ!Box 7340 Service

Error message "ERROR: Entry conflicts with an internal rule" when configuring port forwarding

You cannot forward a TCP or UDP port in the FRITZ!Box. When trying to configure a port forwarding rule, the message "ERROR: Entry conflicts with an internal rule" is displayed.

1 Port is used by the FRITZ!Box

The port you are trying to forward is used by the FRITZ!Box itself and therefore cannot be forwarded for another network device.

Note:Many Internet applications and server services allow you to change the ports for incoming connections. Should you have questions, consult the manufacturer of the Internet application or server service.

The FRITZ!Box uses the following ports:

  • TCP port 21 if the option "Internet access to your storage media via FTP/FTPS enabled" is enabled in the user interface
  • TCP port 443 if MyFRITZ! or Internet access via HTTPS is enabled in the the user interface
  • TCP and UDP port 5060
  • UDP ports 7078-7110
  • TCP port 8089