If the Apache HTTP Server is connecting to an Apache Tomcat server via
mod_jk using the
ajp13 protocol, Servlet API 2.3 requires that the SSL key size be forwarded.
You can configure the Apache HTTP Server to forward the SSL key size using the
JkOptions directive.
To configure the Apache HTTP Server to forward the SSL key size, add this entry to the
httpd.conf or
httpsd.conf file:
JkOptions +ForwardKeySize