diff --git a/backend/helpers/cardApi.js b/backend/helpers/cardApi.js
index 5f3e562..35bf6b2 100644
--- a/backend/helpers/cardApi.js
+++ b/backend/helpers/cardApi.js
@@ -9,6 +9,11 @@
 
 const https = require('https');
 const http  = require('http');
+const dns   = require('dns');
+
+// Force IPv4-first DNS resolution — card.charter.com has both IPv4 and IPv6
+// records but IPv6 is unreachable from this network, causing timeouts.
+dns.setDefaultResultOrder('ipv4first');
 
 // ---------------------------------------------------------------------------
 // Configuration — read from process.env at module load
diff --git a/backend/scripts/card-connectivity-test.js b/backend/scripts/card-connectivity-test.js
index bc61989..84b89dd 100644
--- a/backend/scripts/card-connectivity-test.js
+++ b/backend/scripts/card-connectivity-test.js
@@ -3,6 +3,7 @@
  * CARD API Connectivity Test
  * Tests: token acquisition → teams list → sample asset lookup
  */
+require('dns').setDefaultResultOrder('ipv4first');
 require('dotenv').config({ path: require('path').join(__dirname, '..', '.env') });
 
 const { isConfigured, missingVars, testConnection, getTeams } = require('../helpers/cardApi');