U.S. flag

An official website of the United States government

Technical Notice: 403 Errors on Redirect to OFAC Sanctions List Data

Release Date
Recent Actions Body

On May 6, 2024, OFAC launched its Sanctions List Service (SLS) application (https://sanctionslist.ofac.treas.gov/Home/index.html).  When SLS was launched, OFAC implemented URL redirects that automatically diverted traffic headed to the prior hosted location of OFAC's sanctions list data files, to the new SLS-hosted location.  

Therefore, users visiting a file hosted at the following URL:

  • https:// www. treasury.gov/ofac/downloads/{FILE_NAME.EXTENSION} 

would be automatically diverted to the following new URL:

  • https:// sanctionslistservice.ofac.treas.gov/api/PublicationPreview/exports/{FILE_NAME.EXTENSION} 

OFAC has received reports that users with automated processes designed to download sanctions data files at the old URLs, are now receiving "403 errors" when attempting to access the SLS hosted files, via the above-mentioned automatic redirects. Internal testing conducted by OFAC found that the new SLS host requires all requests to have a "User-Agent" entry in the request's header (e.g. identifies the request as coming from as Chrome, Mozilla, etc.).  Applications written in .NET (and potentially other languages), do not specify a User-Agent by default. Therefore, users will need to explicitly add the User-Agent value to their HTTP request headers to avoid receiving this 403 error.  

For additional technical support on this or other matters, please contact OFAC at O_F_A_C@treasury.gov