In January 2020 Microsoft enforced TLS 1.2 for intra-service traffic in all Azure services. For Synapse SQL on-demand, this resulted in TLS 1.2 being enforced on outbound connections used by all SQL client applications.
Because SQL on-demand architecture relies on various components that communicate with each other using TLS, versions of SQL client applications that use TLS 1.1 should be updated and changed to TLS 1.2.
Learn more.