After upgrading tomcat7 to 7.0.100, the AJP connector was only listening on 127.0.0.1. Initially I edited the wrong server.xml in /etc/tomcat7/server.xml which was not used. The right one is /var/lib/tomcat7/conf/server.xml at least for me. I added these two parameters:
address="0.0.0.0"
requiredSecret="false"
Now it listens on all interfaces, as before. However when I try to access it using mod_jk I get a 403. A sniffer conifrms that this is comming from the AJP connector. So I tried to set
allowedRequestAttributesPattern=".*"
Which does not solve the issue. Any ideas?