diff --git a/database/database.go b/database/database.go
index d1e6fe7..14ce774 100644
--- a/database/database.go
+++ b/database/database.go
@@ -420,9 +420,8 @@ func DBUpdateFrpcInstance(instance FrpcInstance) error {
 
 func DBListFrpcInstances() ([]FrpcInstance, error) {
 	rows, err := global.FrpcDB.Query(`
-		SELECT fi.id, fi.userID, fi.name, fi.bootAtStart, fi.runUser, fi.configPath, fi.createdAt, fi.watchdog, u.username
-		FROM frpcInstances fi
-		JOIN userLogin u ON fi.userID = u.userID
+		SELECT id, userID, name, bootAtStart, runUser, configPath, createdAt, watchdog
+		FROM frpcInstances
 	`)
 	if err != nil {
 		return nil, fmt.Errorf("failed to query all frpc instances: %w", err)
@@ -433,10 +432,19 @@ func DBListFrpcInstances() ([]FrpcInstance, error) {
 	for rows.Next() {
 		var instance FrpcInstance
 		var createdAtStr string
-		if err := rows.Scan(&instance.ID, &instance.UserID, &instance.Name, &instance.BootAtStart, &instance.RunUser, &instance.ConfigPath, &createdAtStr, &instance.Watchdog, &instance.CreatedBy); err != nil {
+		if err := rows.Scan(&instance.ID, &instance.UserID, &instance.Name, &instance.BootAtStart, &instance.RunUser, &instance.ConfigPath, &createdAtStr, &instance.Watchdog); err != nil {
 			return nil, fmt.Errorf("failed to scan frpc instance: %w", err)
 		}
 		instance.CreatedAt, _ = time.Parse(time.RFC3339, createdAtStr)
+
+		user, err := GetUserByID(instance.UserID)
+		if err != nil {
+			postLog.Warning(fmt.Sprintf("[DBListFrpcInstances] Failed to get user %d: %v", instance.UserID, err))
+			instance.CreatedBy = "unknown"
+		} else {
+			instance.CreatedBy = user.Username
+		}
+
 		instances = append(instances, instance)
 	}
 
@@ -466,7 +474,9 @@ func GetServiceNameByInstanceID(instanceID int) (string, error) {
 
 	user, err := GetUserByID(instance.UserID)
 	if err != nil {
-		return "", fmt.Errorf("failed to get user info: %w", err)
+		postLog.Warning(fmt.Sprintf("[GetServiceNameByInstanceID] User %d not found, using fallback", instance.UserID))
+		serviceName := fmt.Sprintf("superfrpc_unknown_%s", instance.Name)
+		return serviceName, nil
 	}
 
 	serviceName := fmt.Sprintf("superfrpc_%s_%s", user.Username, instance.Name)
diff --git a/docs/api.md b/docs/api.md
index 82e96dd..50b4efd 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -1234,7 +1234,7 @@ X-Timestamp: 1704067200000
 **Endpoint:** `/frpcAct/proxyMgr/list`  
 **Method:** GET  
 **Auth Required:** Yes (token)  
-**Permission Level:** None (any permission level)
+**Permission Level:** Visitor
 
 Retrieve a list of all proxy configurations for a specific frpc instance. The proxy configurations are read from the instance's config file.
 
@@ -1314,7 +1314,7 @@ X-Timestamp: 1704067200000
 **Endpoint:** `/frpcAct/instanceMgr/list`  
 **Method:** GET  
 **Auth Required:** Yes (token)  
-**Permission Level:** Admin
+**Permission Level:** Visitor
 
 Retrieve a list of all frpc instances on the server.
 
@@ -1363,7 +1363,7 @@ X-Timestamp: 1704067200000
 **Auth Required:** Yes (token)  
 **Permission Level:** Visitor
 
-Retrieve information about a specific frpc instance. Returns different information based on user permission level.
+Retrieve information about a specific frpc instance.
 
 **Request Headers:**
 ```
diff --git a/handlers/instance.go b/handlers/instance.go
index 6906c2e..edb8fd0 100644
--- a/handlers/instance.go
+++ b/handlers/instance.go
@@ -499,14 +499,15 @@ func getNumFromMap(m map[string]interface{}, key string) int {
 }
 
 func ListInstancesHandler(w http.ResponseWriter, r *http.Request) {
-	userID, err := utils.Auth(w, r, http.MethodGet, "superuser", "admin")
+	userID, err := utils.Auth(w, r, http.MethodGet, "visitor", "admin", "superuser")
 	if err != nil {
-		utils.SendErrorResponse(w, http.StatusUnauthorized, err.Error())
+		utils.SendErrorResponse(w, http.StatusUnauthorized, "invalid token or timestamp")
 		postLog.Warning(fmt.Sprintf("[ListInstancesHandler] Auth failed: %v", err))
 		return
 	}
 
 	instances, err := database.DBListFrpcInstances()
+	postLog.Debug(fmt.Sprintf("[ListInstancesHandler] Retrieved %d instances", len(instances)))
 	if err != nil {
 		postLog.Error(fmt.Sprintf("[ListInstancesHandler] Failed to get all instances: %v", err))
 		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to get instances")
@@ -967,11 +968,6 @@ func GetInstanceInfoHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if instance.UserID != userID {
-		utils.SendErrorResponse(w, http.StatusForbidden, "Instance not found")
-		return
-	}
-
 	user, err := database.GetUserByID(userID)
 	if err != nil {
 		postLog.Error(fmt.Sprintf("[GetInstanceInfoHandler] Failed to get user info: %v", err))
diff --git a/handlers/proxy.go b/handlers/proxy.go
index a97efa5..5762105 100644
--- a/handlers/proxy.go
+++ b/handlers/proxy.go
@@ -295,7 +295,7 @@ func DeleteProxyHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func ListProxiesHandler(w http.ResponseWriter, r *http.Request) {
-	userID, err := utils.Auth(w, r, http.MethodGet)
+	_, err := utils.Auth(w, r, http.MethodGet)
 	if err != nil {
 		utils.SendErrorResponse(w, http.StatusUnauthorized, err.Error())
 		postLog.Warning(fmt.Sprintf("[ListProxiesHandler] Auth failed: %v", err))
@@ -319,12 +319,6 @@ func ListProxiesHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if instance.UserID != userID {
-		postLog.Error(fmt.Sprintf("[ListProxiesHandler] Instance not found for user %d", userID))
-		utils.SendErrorResponse(w, http.StatusNotFound, "Instance not found")
-		return
-	}
-
 	configContent, err := os.ReadFile(instance.ConfigPath)
 	if err != nil {
 		postLog.Error(fmt.Sprintf("[ListProxiesHandler] Failed to read config file %s: %v", instance.ConfigPath, err))