After disabling TLS 1.0 on a PC, reports and receipts generated by Crystal Reports on that PC fail with a message similar to:
Receipt Printing Failure
Error in file C:\Users\username\AppData\Local\Temp\1\ReportName{hexchars}.rpt:
Unable to connect: incorrect log on parameters.
OK
The only known way to get these working again is to reenable TLS 1.0. For the procedure, see the linked article below "Multiple Products: SQL Server service will not start, error code -2146893007".