Looking for logging into the F400 Benutzer site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the F400 Benutzer site. After that you can login as usual with your login credentials.
https://www.heise.de/tipps-tricks/Windows-10-Automatische-Anmeldung-ohne-Passwort-so-geht-s-3995630.html
https://de.wikipedia.org/wiki/Login_(Informationstechnik)
https://www.deskmodder.de/wiki/index.php/Klassische_Anmeldung_in_Windows_10_f%C3%BCr_alle_Benutzer_anzeigen
https://www.telekom.de/hilfe/geraete-zubehoer/telefone-und-anlagen/octopus/octopus-f100-650-f470-670-uc/kundenmanager
https://administrator.de/forum/siemens-octopus-f400-reset-knopf-bet%C3%A4tigt-346243.html
http://www.telefonanlagenforum.de/forum/threads/octopus-f400-konfigutrationsinterface-nicht-mehr-erreichbar.6487/