diff --git a/server.js b/server.js
index 6c22b02..0855f2c 100644
--- a/server.js
+++ b/server.js
@@ -19,6 +19,16 @@
  ***********************************************************************************************************************************************************************/
 require('dotenv').config();
 
+// Force IPv4-only outbound connections. Hosts that resolve AAAA records but
+// have no working IPv6 route (e.g. to Google's OAuth endpoints) hit ENETUNREACH
+// on the v6 attempt — and Node's dual-stack "Happy Eyeballs" connector
+// (autoSelectFamily) throws AggregateError instead of falling back cleanly to
+// the reachable IPv4 address. dns.setDefaultResultOrder alone does NOT fix
+// this (the connector still races both families); autoSelectFamily has to be
+// disabled outright. See [AUTH] googleCallback OIDC error: AxiosError [AggregateError].
+require('net').setDefaultAutoSelectFamily(false);
+require('dns').setDefaultResultOrder('ipv4first');
+
 const express = require('express');
 const cors = require('cors');
 const cookieParser = require('cookie-parser');