2 Widow 7 SP1 workstations running Sage 100 version 4.3 (gasp) get Error: ""Unable to communicate with Sage Payment Solutions - Exception occurred (err/ret=2/0)"" when processing a credit card transaction - but a third on Windows 10, has no issues. IT Updated TLS 1.2 and .Net 4.7.1 on these Win 7s but still can't connect. It's not SED, since 4.3 doesn't use it. The usually fixes for this error are shutting down AV, firewall, etc. and testing. The error still occurs. Convinced Win 10 has something unique that will allow CC communication, if I could only figure out what it is. Likely easier to upgrade but customer wanted to hold off until Sept. May not be able to now.