If your organization handles sensitive information on the web (Credit Card info, HealthCare info, etc) you are probably using the latest TLS protocol (1.2). And if you are connecting to MS SQL Server through OLEDB, you may have had trouble connecting recently. This is because the SQLOLEDB provider and the SQL Server ODBC driver are no longer supported in TLS 1.2.
At the end of March, Microsoft released a new OLEDB Driver (MSOLEDBSQL) that does support TLS 1.2.
Thanks to Lyle Hardin of Foslyn LLC for sharing this info and links.