I got all the same errors. Lacerte tech support was no help. I bet you cannot open your Quickbooks either.  I googledthe error and found that their was an issue in a 2017 Lacerte year. They called it TLS 1.2 protcol error. In Internet explorer my TLS 1.2 was checked like it was suppose to be.   However as I kept reading they said Make sure you have the Latest Internet Explorer downloaded. When I downloaded the latest internet explorer 11.0 it fixed the error.

Microsoft and Dell wanted me to reset my windows and lose all my programs. So far downloading the latest internet explorer worked for me. There must have been some corruption to the TLS 1.2 Good luck as I had been battling this for almost a week.