Tomcat version number
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To confuse potential hackers or at least their stupid automated scripts, hide the real version number of your tomcat installation:
This attribute within the Connector element in server.xml is for the HTTP response header:
server="Tomcat/9.99"
You might have to add that attribute two times, once for the normel http port 80/8080 and once for the ssl port if enabled.
These lines for the visible parts in the tomcat status pages:
mkdir -p $CATALINA_HOME/lib/org/apache/catalina/util
cd $CATALINA_HOME/lib/org/apache/catalina/util
vi ServerInfo.properties
server.info=Apache Tomcat 9.99