用戶端 %1 要求 %2 的服務票證遭到拒絕，因為需要 User2User。用戶端要求使用者主體的服務票證時，KDC 回應這個錯誤 (安全性風險)。用戶端必須支援 User2User，才能取得所要求服務主體的服務票證

A service ticket request by client %1 for %2 was rejected because User2User was required. The KDC responds with this error when a client requests a service ticket for a user principal (a security risk). The client must support User2User in order to obtain a service ticket for the requested service principal