Hello,
for my it's https://xx.xx.xx.xx/sysmgr/v4/, can you try ?
Or jsut the IP adress, the redirect must redirect you to the good page
Or this message : ERR_SSL_KEY_USAGE_INCOMPATIBLE
Have you try another web browser ?
Last chance it's could be an Certificat issue or expiration try to see this article :
https://kb.netapp.com/onprem/ontap/os/How_to_renew_a_Self-Signed_SSL_certificate_in_ONTAP_9
the command to check :
security certificate show -fields vserver,common-name,serial,ca,type,expiration -type server