diff --git a/backend/internal/handler/redis.go b/backend/internal/handler/redis.go
index 4112ea6..f931b5e 100644
--- a/backend/internal/handler/redis.go
+++ b/backend/internal/handler/redis.go
@@ -3,6 +3,7 @@ package handler
 import (
 	"context"
 	"fmt"
+	"net"
 	"net/http"
 	"strconv"
 	"strings"
@@ -393,10 +394,15 @@ func getRedisClient(instance *model.Instance, db int) (*redisClientWrapper, erro
 			if len(slot.Nodes) == 0 {
 				continue
 			}
-			nodeAddr := slot.Nodes[0].Addr
-			if idx := strings.LastIndex(nodeAddr, ":"); idx >= 0 {
-				nodeAddr = instance.Host + nodeAddr[idx:]
-			}
+				nodeAddr := slot.Nodes[0].Addr
+				// 只在 Redis 上报空/回环地址时才用配置 host 兜底（NAT / 端口映射场景）。
+				// 多机集群必须保留 Redis 上报的真实主机，否则会把跨机节点全部指向种子机，
+				// 导致 "dial tcp <种子机>:<其他机器的端口>: connection refused"。
+				if h, p, err := net.SplitHostPort(nodeAddr); err == nil {
+					if h == "" || h == "127.0.0.1" || h == "0.0.0.0" {
+						nodeAddr = net.JoinHostPort(instance.Host, p)
+					}
+				}
 			if !seen[nodeAddr] {
 				seen[nodeAddr] = true
 				addrs = append(addrs, nodeAddr)