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NOTICE DATE:  June 15, 2017

NOTICE TYPE:  M-B052417-03 Planned Maintenance

SHORT DESCRIPTION:  Implementation of Web Application DNS changes



DAY AFFECTED:  June 22, 2017 17:30 and 20:30

LONG DESCRIPTION:  ERCOT is implementing changes to the Domain Name System (DNS) resource name indicated below.  As a result, IP addresses are subject to change without notice. Therefore, Fully Qualified Domain Names (FQDNs) must be used to reference ERCOT resources instead of hard-coded IP addresses.

The following URL is affected by this change:




Fully Qualified Domain Name


Current IP Address

To-Be IP Address

ERCOT Website




Market Participants (MPs) are encouraged to ensure their whitelists include the FQDN to avoid any interruption of service.


The changes will be implemented between the hours of 17:30 and 20:30 on June 22, 2017.


Based on MP configurations users may experience an outage of up to 30 minutes if attempting to access this site during the change window. 


ADDITIONAL INFORMATION:  For issues connecting to the website, it is recommended that MPs:


·         Clear their browser history.

·         Restart their browsers.

·         Contact the ERCOT Help Desk by phone at (512) 248-6800 or via email at [log in to unmask] if an error message is received stating “Access Denied, Powered by Incapsula".


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].

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