***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. *****

NOTICE DATE:  May 24, 2017

NOTICE TYPE:  M-B052417-01 Planned Maintenance

SHORT DESCRIPTION:  Implementation of Web Application DNS changes

INTENDED AUDIENCE:  ERCOT Market Participants



DAY AFFECTED:  May 31, 2017 17:30 and 20:30

LONG DESCRIPTION:  ERCOT is implementing changes to the (Domain Name System) DNS resource names 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 URLs are affected by this change:



Site

(URL)

Fully Qualified Domain Name

(FQDN)

Current IP Address

To-Be IP Address

Flight Testing Website

(https://etod.ercot.com/)



etod.ercot.com<https://etod.ercot.com/>

66.128.16.172

192.230.66.59

Renewable Energy Credit (REC) Program

(https://urldefense.proofpoint.com/v2/url?u=https-3A__www.texasrenewables.com_&d=DwIFAg&c=trp9rTvIdyEWh1VWB5x8_2JiPaB5oGZOtWPDws2_VoY&r=neGuCzL_X6x1s7qZM6ZAC_Rtl33TCbxYuxfTMTAn9b_aw_S_JW7X70089vUXR-dS&m=1MGhcW8Lq-dtmong0FaxujVN6zUXaxnxyyRQ785olk8&s=5KyRbm6xLpo1NgPNULAtHR3N_7YX5ex1j0XZB2E6qRQ&e= )



www.texasrenewables.com<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.texasrenewables.com_&d=DwIFAg&c=trp9rTvIdyEWh1VWB5x8_2JiPaB5oGZOtWPDws2_VoY&r=neGuCzL_X6x1s7qZM6ZAC_Rtl33TCbxYuxfTMTAn9b_aw_S_JW7X70089vUXR-dS&m=1MGhcW8Lq-dtmong0FaxujVN6zUXaxnxyyRQ785olk8&s=5KyRbm6xLpo1NgPNULAtHR3N_7YX5ex1j0XZB2E6qRQ&e= >

66.128.16.171

192.230.66.101



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 May 31, 2017.



Based on MP configurations users may experience an outage of up to 30 minutes if attempting to access these sites 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]<mailto:[log in to unmask]>.

If you are receiving email from an 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.









sa