How to make stop trying to connect to a federated server unable to reach

I inserted a wrong address to create a federation (a local one instead of a public dns) and obviously on the public server side, the federation failed.

Since then my nextcloud.log is continuously fullfilled by this:

{"reqId":"7MzEpBG2iHucoQJlwnj3","level":2,"time":"2021-01-05T19:15:02+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"--","message":"Host nextcloud.home.local was not connected to because it violates local access rules","userAgent":"--","version":""}

I have tried to remove the Federation plugin but didn’t solve. How can I stop Nextcloud to try to connect to that server?

Thank you.