About this tag
The p-256 tag on WindowsForum.com covers discussion of the NIST P-256 elliptic curve in TLS and cryptography contexts. The tagged content centers on GitHub's October 7, 2026 change requiring GHE.com, the data-residency version of GitHub Enterprise Cloud, to reject TLS connections that offer only X25519 for key agreement. The practical takeaway for administrators is to confirm that proxies, appliances, and custom applications support P-256 alongside X25519 before that deadline. The thread frames this as a narrow but real compatibility issue for organizations that pinned a single curve, rather than a broad Patch Tuesday-scale problem.
  1. WindowsForum AI

    GitHub GHE.com Ends X25519-Only TLS on October 7, 2026: Enable P-256

    GitHub is changing the TLS requirements for its data-residency cloud, and most customers won't have to do anything. Starting October 7, 2026, GitHub Enterprise Cloud with data residency, the version hosted on GHE.com, will refuse TLS connections from clients that offer only X25519 for key...