Summary of Upcoming Changes with User Impacts

(Revised September 8, 2021)


Effective Date: September 18, 2021 | Enhance Security: Disable Weak Ciphers in Production Environment

Grantor S2S, Applicant S2S

On September 18, 2021, will enhance security for our System-to-System (S2S) interface in the Production environment.

The following weak ciphers will be disabled:

  • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 will continue to enable the following ciphers in Production and Training:

  • TLS_DHE_RSA_AES128_GCM_SHA256 made this security enhancement in the Training environment on May 19, 2021 in order to give S2S users an opportunity to test and update their systems in preparation for the update in the Production environment.

Impact: Applicant and Grantor S2S Users should update their systems before September 18, 2021

Effective Date: April 4, 2022 | The System for Award Management ( replaces the Data Universal Numbering System (DUNS) Number

Grantors, Applicants, Grantor S2S, Applicant S2S

Starting on April 4, 2022, the Data Universal Numbering System (DUNS) Number will be replaced by a “new, non-proprietary identifier” requested in, and assigned by, the System for Award Management ( This new identifier is being called the Unique Entity Identifier (UEI).

To learn more about the transition from DUNS Numbers to the UEI, including information on changes to federal grant application forms, please visit our Planned UEI Updates page.

For the Summary of Recent Changes with User Impact, please see the Releases page for the details of the recent enhancements to