**This message contains important details about changes to the Exchange Network Authentication and Authorization Service (NAAS)** 

Thank you to all the teams that have worked patiently to help test and troubleshoot the updated NAAS TEST environment.

Based on the testing and resolution of almost all reported issues, the migration of the NAAS application is proceeding in PRODUCTION on Saturday, April 24th from 8am to 4pm.

After the migration, EPA and its contractors will be actively monitoring traffic, working with the Exchange Network Help Desk, and partnering with teams to address any reported issues as quickly as possible. Please continue to work with the Exchange Network Help Desk if you have any questions or concerns.

Reminders:

• The Exchange Network Help Desk can provide new Secure Authentication Keys if you need one for TEST or PRODUCTION.
   
• New TEST and PRODUCTION IP Addresses are listed below. If you have outbound firewall rules to the NAAS, please make sure you enable access to these IP Addresses:
  • TEST: 204.47.254.135
  • PRODUCTION: 204.47.254.197

EXCHANGE NETWORK HELP DESK

• Email: [email protected]
   
• Phone: 1-888-890-1995 (Select Option 1 and then Option 5 from the menu) 
  Available 8:00 AM – 6:00 PM Eastern