There's some F5 WAF within the network where our WildFly is running. The WAF sends multiple Keep Alive-Requests to our WAF via TCP, but without sending "close_notify" after the communication has ended.
Undertow throws UT005013, which is correct, but this causes the JVM to run out of Memory. The keepalive is sent 12 times per minute (every 5 seconds) to our WildFly.
We already installed an update of Undertow (1.4.3); This didn't help.