diff --git a/app/api/rmbg/route.ts b/app/api/rmbg/route.ts
index a187dd03a..b8d70a5c5 100644
--- a/app/api/rmbg/route.ts
+++ b/app/api/rmbg/route.ts
@@ -212,6 +212,7 @@ export async function POST(request: NextRequest) {
       
       // 检查是否是网络连接错误
       if (fetchError instanceof Error) {
+        // 检查超时错误
         if (fetchError.name === 'AbortError') {
           return NextResponse.json(
             { 
@@ -222,14 +223,28 @@ export async function POST(request: NextRequest) {
           );
         }
         
-        if (fetchError.message.includes('EHOSTUNREACH') || 
-            fetchError.message.includes('ENOTFOUND') ||
-            fetchError.message.includes('ECONNREFUSED') ||
-            fetchError.message.includes('No route to host')) {
+        // 检查错误消息和cause中的网络错误
+        const errorMessage = fetchError.message || '';
+        const errorCause = (fetchError as any).cause;
+        const causeMessage = errorCause?.message || '';
+        const causeCode = errorCause?.code || '';
+        
+        // 检查各种网络连接错误
+        if (errorMessage.includes('EHOSTUNREACH') || 
+            errorMessage.includes('ENOTFOUND') ||
+            errorMessage.includes('ECONNREFUSED') ||
+            errorMessage.includes('No route to host') ||
+            causeMessage.includes('EHOSTUNREACH') ||
+            causeMessage.includes('ENOTFOUND') ||
+            causeMessage.includes('ECONNREFUSED') ||
+            causeMessage.includes('No route to host') ||
+            causeCode === 'EHOSTUNREACH' ||
+            causeCode === 'ENOTFOUND' ||
+            causeCode === 'ECONNREFUSED') {
           return NextResponse.json(
             { 
               error: "无法连接到抠图API服务器",
-              detail: `服务器无法访问 ${apiUrl}，请检查：\n1. API服务器是否在线\n2. 网络连接是否正常\n3. 防火墙设置是否正确`,
+              detail: `服务器无法访问 ${apiUrl}，请检查：\n1. API服务器是否在线\n2. 网络连接是否正常\n3. 防火墙设置是否正确\n4. 端口8000是否已开放`,
             },
             { status: 503 }
           );