RCSB PDB has recently introduced DNS names for programmatic access to PDB archive downloads: FTP: ftp://ftp.rcsb.org HTTPS: https://files.wwpdb.org (replaces https://ftp.rcsb.org) RSYNC: rsync://rsync.rcsb.org (replaces rsync://rcsb.org) The File Download Services <https://www.rcsb.org/docs/programmatic-access/file-download-services> documentation has detailed information. Starting *September 19th 2023 (1 week from now)*, RCSB PDB will start enforcing use of these updated DNS names. URLs in which the DNS name doesn’t match the protocol (e.g., https://ftp.rcsb.org, ftp://files.rcsb.org) will no longer work at that time. Users who download PDB archive data programmatically are encouraged to switch to the new DNS names as soon as possible. HTTPS protocol is preferred (over FTP) for individual file downloads. Please contact info@rcsb.org with any questions. Many thanks Jose --- Jose Duarte RCSB Protein Data Bank San Diego Supercomputer Center UC San Diego La Jolla CA, USA