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https://blog.it-kb.ru/2015/04/03/sql-server-windows-login-create-failed-for-login-the-server-principal-already-exists-error-15025-after-rename-user-account-in-active-direcory-domain-and-how-map-convert-sql-login-sid-to-domain-objects/
Ошибка при создании Login в SQL Server - Create failed for Login - The server principal already exists - Error 15025 или история одного "тупняка"…