On Chrome, the following comes up with a red warning:
Your connection is not private
Attackers might be trying to steal your information from stearnvault.com (for example, passwords, messages, or credit cards). Learn more
NET::ERR_CERT_COMMON_NAME_INVALID
To get Chrome’s highest level of security, turn on enhanced protection
stearnvault.com normally uses encryption to protect your information. When Chrome tried to connect to stearnvault.com this time, the website sent back unusual and incorrect credentials. This may happen when an attacker is trying to pretend to be stearnvault.com, or a Wi-Fi sign-in screen has interrupted the connection. Your information is still secure because Chrome stopped the connection before any data was exchanged.
You cannot visit stearnvault.com right now because the website uses HSTS. Network errors and attacks are usually temporary, so this page will probably work later.
Similar greetings from MS Edge, and presumably other browsers. Not possible to log in from a standard Chrome tab, possible in a Chrome Incognito Window, or MS Edge, other browsers not tested.
Googling the error code can bring up a range of workarounds, in the case of Stearnvault, it’s unsurprisingly an issue with the certificate itself, as the error indeed indicates.
Solution: Report to Site Admin.
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