[23-07-2019: 06.57] UPDATE: The issue is resolved, OpenDNS can be used again.
Customers using the Cisco Umbrella/OpenDNS service in their corporate network may be experiencing problems and see an error message about the SSL certificate when attempting to access securelogin.nu or any of the subdomains.
Cisco Umbrella uses OpenDNS, which is not allowing access to the domain securelogin.nu at the moment for an unknown reason. We have filed a support request at OpenDNS, but do not have an indication on when access will be restored.
In the meantime we advise customers to try to connect to securelogin.nu through an alternative DNS.
This problem was initially reported at 19 July 9.02 AM