In environments where IPv6 is enabled, the core server caused high CPU loads after being idle for some time. The CPU load decreased during checks but increased again once the checks were finished.
This issue was caused by an internal bug in the Jetty web server and has been resolved by updating the relevant files.
Resolving the Problem
Upgrade to Acrolinx Server 2.7.2. Administrators should enable IPv6 support by setting the property enableIPv6CompatibilityMode=true in the core server properties file.