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Edit: the problem is with https://phonetools.cox.com/. Nothing can be accessed normally past it without dealing with the dire Google Chrome warning.
Perhaps this has something to do with changing from daylight savings time to standard... please advise.
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Firefox refused to connect to phonetools.cox.com with the message "Your connection is not secure." The details indicate the Cox certificate expired 11/5/18 06:54:54 am SEC_ERROR_EXPIRED_CERT. . I clicked on Advanced to add it as an exception, but unchecked the "Permanent" box. This allowed me into phone tools for the current session, but after restarting my computer the error message came back. Someone at Cox needs to update their certificate - - this could be a hack.