mod_proxy_cluster gets stuck with 20 nodes

(given you have tomcat container image and the test config): run httpd with mod_proxy_cluster execute for i in {1..20}; do docker run -d --network=host -e tomcat_ajp_port=8010 -e tomcat_address=127.0.0.$i -e tomcat_shutdown_port=8005 -e jv m_route=tomcat$i --name tomcat$i tomcat-image; done once nodes all running it stops responding: check http://localhost:6666 or http://localhost:6666/mod_cluster_manager