NOTICE DATE: December 2, 2022
NOTICE TYPE: M-A062822-09 General
SHORT DESCRIPTION: Rescheduled – ERCOT TLS1.0 and TLS1.1 protocol deprecation on ERCOT’s External Web Services API
INTENDED AUDIENCE: Market Participant personnel who administer programmatic access to ERCOT’s production and testing environments and User Security Administrators (USAs)
DAYS AFFECTED: December 5, 2022
LONG DESCRIPTION: Due to changes in security industry standards, ERCOT is deprecating the TLS1.0 and TLS1.1 protocols used in communication to all programmatic access to ERCOT’s Production External Web Services API (MISAPI.ERCOT.COM and API.WAN.ERCOT.COM) as well as all ERCOT-initiated Notifications sent to Market Participants. This change was originally scheduled for November 30, 2022 and has been rescheduled.
On December 5, 2022, beginning at 15:00 CST, ERCOT will update the Production External Web Services APIs to only allow the TLS1.2 protocol for all programmatic access.
ACTION REQUIRED: Market Participant personnel who administer programmatic access to ERCOT’s production and testing environments will need to ensure that only the TLS1.2 protocol is used for connectivity to ERCOT. ERCOT encourages Market Participants to adopt these changes prior to the date listed as ERCOT already supports the TLS1.2 protocol. Failure to make the required changes on the Market Participant side can cause connection errors and will prevent access to ERCOT’s External Web Services APIs as well as a loss of automated Notifications.
ADDITIONAL INFORMATION: A presentation of the TLS protocols is available for users to understand the importance of the deprecation of the legacy TLS protocols for the security of web communication.
Market Notices have been issued communicating the previously-scheduled dates for the TLS deprecation.
The Technology Working Group has discussed the deprecation of the legacy TLS protocols in the following meetings:
CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at [log in to unmask].
If you are receiving email from a public ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com.