diff -Naur 0ad-0.0.26-alpha.old/source/network/NetServer.cpp 0ad-0.0.26-alpha/source/network/NetServer.cpp
--- 0ad-0.0.26-alpha.old/source/network/NetServer.cpp	2024-10-08 23:50:11.583206377 +0200
+++ 0ad-0.0.26-alpha/source/network/NetServer.cpp	2024-10-08 23:53:47.161712553 +0200
@@ -302,7 +302,11 @@
 	else if ((devlist = upnpDiscover(10000, 0, 0, 0, 0, 0)) != NULL)
 #endif
 	{
+#if defined(MINIUPNPC_API_VERSION) && MINIUPNPC_API_VERSION >= 18
+		ret = UPNP_GetValidIGD(devlist, &urls, &data, internalIPAddress, sizeof(internalIPAddress), nullptr, 0);
+#else
 		ret = UPNP_GetValidIGD(devlist, &urls, &data, internalIPAddress, sizeof(internalIPAddress));
+#endif
 		allocatedUrls = ret != 0; // urls is allocated on non-zero return values
 	}
 	else
@@ -320,10 +324,21 @@
 	case 1:
 		LOGMESSAGE("Net server: found valid IGD = %s", urls.controlURL);
 		break;
+#if defined(MINIUPNPC_API_VERSION) && MINIUPNPC_API_VERSION >= 18
+	case 2:
+		LOGMESSAGE("Net server: found IGD with reserved IP = %s, will try to continue anyway", urls.controlURL);
+		break;
+	case 3:
+#else
 	case 2:
+#endif
 		LOGMESSAGE("Net server: found a valid, not connected IGD = %s, will try to continue anyway", urls.controlURL);
 		break;
+#if defined(MINIUPNPC_API_VERSION) && MINIUPNPC_API_VERSION >= 18
+	case 4:
+#else
 	case 3:
+#endif
 		LOGMESSAGE("Net server: found a UPnP device unrecognized as IGD = %s, will try to continue anyway", urls.controlURL);
 		break;
 	default: