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11/18/22 1:40 PM

M-A062822-06 Reminder - ERCOT TLS1.0 and TLS1.1 protocol deprecation on ERCOT's External Web Services API


NOTICE DATE: November 18, 2022

NOTICE TYPE: M-A062822-07 General

SHORT DESCRIPTION: Reminder – 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: November 30, 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. 

On November 30, 2022, ERCOT will update the Production External Web Services APIs to only allow the TLS1.2 protocol for all programmatic access.

  • Note that this effort causes no impacts to Market Participants who access the Market Information System (MIS) or other ERCOT websites through a web browser.

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.

Six Market Notices have been issued communicating the 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 ClientServices@ercot.com.

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mm