FRITZ!Powerline 510E – Service - Knowledge Base
FRITZ!Box reports "Connected the known powerline adapter [...]"
The message "Connected the known powerline adapter [MAC address]" is displayed frequently in the event log of the FRITZ!Box.
Not caused by an error
The message is displayed when the FRITZ!Box checks the connection to FRITZ!Powerline or another powerline adapter, and the connection is functioning properly.
This means that the message is simply a normal status message and not caused by an error.