NOTICE DATE: September 24, 2008 NOTICE TYPE: W-A092208-03 Operations SHORT DESCRIPTION: Rescheduled MOSTML Migration INTENDED AUDIENCE: ERCOT Market Participants DAYS AFFECTED: September 25, 2008 LONG DESCRIPTION: The rescheduled migration of MOSTML listener application is scheduled for September 25, 2008 at 9:00 AM CPT. ERCOT will migrate MOSTML and the listener application to new hardware. Market Participants will not need to update sender configurations immediately. By October 2, 2008 Market Participants need to update their sender configurations(API) to send to https://mostml.ercot.com/ercot-xml/servlet/Listener instead of https://mos.ercot.com/ercot-xml/servlet/Listener and should verify their firewall port (443) is open. Market Participants can use an IP address to connect to the listener as follows: If using the WAN to connect -192.168.172.88 If using the Internet to connect - 66.128.17.88 Both listeners will be available until October 2, 2008. During the migration, a brief disruption in TML Market functionality may occur. 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 e-mail at [log in to unmask] <blocked::mailto:[log in to unmask]> . If you are receiving e-mail 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 <http://lists.ercot.com/> ad