If you administer your organization’s Exchange Network Node, please be advised that U.S. EPA’s Central Data Exchange (CDX) is making a change to several Exchange Network services after hours on May 22. The CDX team anticipates that most EN partners will not be impacted by these changes, but please see the details below to determine if your agency’s Node may be affected.
Updated TLS Ciphers
U.S. EPA will be making a change to encryption for several services run by EPA’s Central Data Exchange (CDX).
After May 22, 2026, encryption ciphers will be limited to the following:
TLS_AES_256_GCM_SHA384
TLS_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
This change will be implemented for the following hostnames:
- cdx.epa.gov
- cdxnodenaas.epa.gov
- cdxnodengn.epa.gov
- cdxtools.epa.gov
- encromerr.epa.gov
- ves.epa.gov
- cdxapi.epa.gov
- cdxnode2.epa.gov
- ends2.epa.gov
- enservices.epa.gov
EPA expects this change to be transparent to all users.
In the event that users or administrators observe encryption-related errors after this date or for more information or answers to questions, please contact the Exchange Network Help Desk at 1-(888)-890-1995 or [email protected].