Looking for logging into the Usg 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 Usg site. After that you can login as usual with your login credentials.
https://community.ubnt.com/t5/UniFi-Routing-Switching/USG-not-allowing-me-to-login-directly/td-p/1164966
https://dl.ubnt.com/guides/UniFi/USG_QSG.pdf
http://www.usgprofessionals.nl/engineering/professionals/mijn-usg-engineering
https://go.view.usg.edu/
https://oneusgconnect.usg.edu/
https://privacy.mijn.startpeople.nl/
https://www.routerdefaults.org/ubiquiti-networks/usg-pro-4
https://support.zyxel.eu/hc/nl/articles/360001378453-Hoe-een-USG-opnieuw-op-te-starten-via-de-webinterfaces
https://www.reddit.com/r/Ubiquiti/comments/9qvsut/usg_tip_when_setting_up_factory_default_usg_login/
https://selfservice.usgpeople.com/SelfService/index_unq.jsp
https://gathering.tweakers.net/forum/list_messages/1845325
https://usgcorp.taleo.net/careersection/2/mysearches.ftl
https://www.usg.com/content/usgcom/en/toolbar/login.html