diff --git a/backend/managers/gameLauncher.js b/backend/managers/gameLauncher.js
index 653b214..16a789f 100644
--- a/backend/managers/gameLauncher.js
+++ b/backend/managers/gameLauncher.js
@@ -482,15 +482,11 @@ async function launchGame(playerNameOverride = null, progressCallback, javaPathO
     }
   }
 
-  // DualAuth Agent: Set JAVA_TOOL_OPTIONS so java picks up -javaagent: flag
-  // This enables runtime auth patching without modifying the server JAR
+  // DualAuth Agent: DISABLED for debug - testing fastutil classloader issue
+  // TODO: re-enable after testing
   const agentJar = path.join(gameLatest, 'Server', 'dualauth-agent.jar');
   if (fs.existsSync(agentJar)) {
-    const agentFlag = `-javaagent:"${agentJar}"`;
-    env.JAVA_TOOL_OPTIONS = env.JAVA_TOOL_OPTIONS
-      ? `${env.JAVA_TOOL_OPTIONS} ${agentFlag} -Xshare:off`
-      : `${agentFlag} -Xshare:off`;
-    console.log('DualAuth Agent: enabled via JAVA_TOOL_OPTIONS');
+    console.log('DualAuth Agent: SKIPPED (debug build - fastutil classloader test)');
   }
 
   try {