diff --git a/proxy/http/HttpProxyServerMain.cc b/proxy/http/HttpProxyServerMain.cc
index 2a755379468..0da59e095e1 100644
--- a/proxy/http/HttpProxyServerMain.cc
+++ b/proxy/http/HttpProxyServerMain.cc
@@ -56,6 +56,10 @@ std::mutex proxyServerMutex;
 std::condition_variable proxyServerCheck;
 bool et_net_threads_ready = false;
 
+std::mutex etUdpMutex;
+std::condition_variable etUdpCheck;
+bool et_udp_threads_ready = false;
+
 extern int num_of_net_threads;
 extern int num_accept_threads;
 
@@ -322,6 +326,15 @@ init_HttpProxyServer()
     lock.unlock();
     proxyServerCheck.notify_one();
   }
+
+#if TS_USE_QUIC == 1
+  if (eventProcessor.has_tg_started(ET_UDP)) {
+    std::unique_lock<std::mutex> lock(etUdpMutex);
+    et_udp_threads_ready = true;
+    lock.unlock();
+    etUdpCheck.notify_one();
+  }
+#endif
 }
 
 void
diff --git a/proxy/http/HttpProxyServerMain.h b/proxy/http/HttpProxyServerMain.h
index 1de9ced2e98..46f59aa1841 100644
--- a/proxy/http/HttpProxyServerMain.h
+++ b/proxy/http/HttpProxyServerMain.h
@@ -52,3 +52,7 @@ NetProcessor::AcceptOptions make_net_accept_options(const HttpProxyPort *port, u
 extern std::mutex proxyServerMutex;
 extern std::condition_variable proxyServerCheck;
 extern bool et_net_threads_ready;
+
+extern std::mutex etUdpMutex;
+extern std::condition_variable etUdpCheck;
+extern bool et_udp_threads_ready;
diff --git a/src/traffic_server/traffic_server.cc b/src/traffic_server/traffic_server.cc
index 4f54e9846ce..c251698e83b 100644
--- a/src/traffic_server/traffic_server.cc
+++ b/src/traffic_server/traffic_server.cc
@@ -2098,6 +2098,7 @@ main(int /* argc ATS_UNUSED */, const char **argv)
     }
     if (num_of_udp_threads) {
       udpNet.start(num_of_udp_threads, stacksize);
+      eventProcessor.thread_group[ET_UDP]._afterStartCallback = init_HttpProxyServer;
     }
 
     // Initialize Response Body Factory
@@ -2135,6 +2136,12 @@ main(int /* argc ATS_UNUSED */, const char **argv)
         proxyServerCheck.wait(lock, [] { return et_net_threads_ready; });
       }
 
+#if TS_USE_QUIC == 1
+      if (num_of_udp_threads) {
+        std::unique_lock<std::mutex> lock(etUdpMutex);
+        etUdpCheck.wait(lock, [] { return et_udp_threads_ready; });
+      }
+#endif
       // Delay only if config value set and flag value is zero
       // (-1 => cache already initialized)
       if (delay_p && ink_atomic_cas(&delay_listen_for_cache, 0, 1)) {