On April 18, 2018, Market Participants will be required to use the new DigiCert SSL Intermediate and Root CA configuration for all programmatic access to ERCOT’s Production External Web Services API (MISAPI.ERCOT.COM and API.WAN.ERCOT.COM). On April 18, 2018, ERCOT will also implement a configuration change to ensure that API communication from Market Participants into ERCOT’s production environment is sent with a handshake-level valid ERCOT issued Client Digital Certificate and each message signed with a valid ERCOT issued Client Digital Certificate.

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