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When a domain computer boots, it tries to establish a Secure Channel with a domain controller. This channel is protected by a Session Key — calculated using the Computer Account Password. ✅ If both sides (computer and DC) calculate the same session key → you're good. ❌ If not → you see the error

𝗪𝗵𝘆 𝗱𝗼𝗲𝘀 𝘁𝗵𝗶𝘀 𝗵𝗮𝗽𝗽𝗲𝗻? Most commonly when the computer tries to authenticate with an outdated password — for example, after restoring a VM snapshot older than 30 days.

𝗙𝘂𝗻 𝗳𝗮𝗰𝘁: Windows stores two versions of the computer password in the registry: ▪️Current password (CurrVal) ▪️Previous password (OldVal) 🔎 But... this doesn't help when both passwords are already outdated across domain controllers. (OldVal mainly exists to handle replication delays)