diff --git a/markbase-core/src/ssh_server/auth.rs b/markbase-core/src/ssh_server/auth.rs
index ba7f911..88e1258 100644
--- a/markbase-core/src/ssh_server/auth.rs
+++ b/markbase-core/src/ssh_server/auth.rs
@@ -62,7 +62,8 @@ impl AuthHandler {
         } else if method == "publickey" {
             // Phase 5仅实现password认证，publickey留待Phase 9优化
             warn!("Public key auth not implemented in Phase 5");
-            Ok(AuthResult::Failure("Public key auth not implemented".to_string()))
+            // SSH_MSG_USERAUTH_FAILURE必须返回可继续使用的认证方法列表
+            Ok(AuthResult::Failure("password".to_string()))
         } else if method == "none" {
             // OpenSSH：none认证总是失败（用于查询支持的认证方法）
             // 返回支持的认证方法列表：password, publickey