diff --git a/packages/trpc/src/services/mount.service.ts b/packages/trpc/src/services/mount.service.ts
index da58ffe..ef5c0ce 100644
--- a/packages/trpc/src/services/mount.service.ts
+++ b/packages/trpc/src/services/mount.service.ts
@@ -214,9 +214,11 @@ function describeWebdavError(e: unknown, path?: string): string {
         s.includes("401") ||
         s.includes("403") ||
         s.includes("unauthorized") ||
-        s.includes("forbidden")
-    )
-        return `认证失败，请检查用户名和密码${pathHint}`;
+        s.includes("forbidden") ||
+        s.includes("not authorized")
+    ) {
+        return `认证失败（服务器拒绝该账号/密码）${pathHint}。请核对飞牛「WebDAV」专用账号密码（常与网页登录不同），并确认地址是否带 /dav 前缀`;
+    }
     if (s.includes("enotfound") || s.includes("eai_again") || s.includes("getaddrinfo"))
         return "无法解析服务器地址";
     if (s.includes("econnrefused")) return "连接被拒绝，请检查地址和端口";