diff --git a/src/chain.ts b/src/chain.ts
index f5370355..14ce2b3c 100644
--- a/src/chain.ts
+++ b/src/chain.ts
@@ -117,6 +117,8 @@ export const chain = (
                 sourceSocket.end(createCustomStatusHttpResponse(status, `UPSTREAM${statusCode}`));
             }
 
+            targetSocket.end();
+
             server.emit('tunnelConnectFailed', {
                 proxyChainId,
                 response,