wildfly-14.0 - https listener stopped abruptly

[Cova]

Dear all,

One of our Wildfly instances stopped abruptly to handle https requests. We checked and Wildfly is no longer listening in https port (8443).

Version: wildfly-14.0.1.Final

java version "1.8.0_161"

Oracle Linux Server release 7.6

standalone.xml

  <socket-binding-group name="standard-sockets" default-interface="public" port-offset="${jboss.socket.binding.port-offset:0}">

        <socket-binding name="management-http" interface="management" port="${jboss.management.http.port:9990}"/>

        <socket-binding name="management-https" interface="management" port="${jboss.management.https.port:9993}"/>

        <socket-binding name="ajp" port="${jboss.ajp.port:8009}"/>

        <socket-binding name="http" port="${jboss.http.port:8080}"/>

        <socket-binding name="https" port="${jboss.https.port:8443}"/>

$ netstat -an | grep 8843

$ lsof -p 4106 | grep https

java    4106  mmt  mem       REG              249,2     13048   16936336 /opt/seven/wildfly-14.0.1.Final/modules/system/layers/base/org/jboss/ws/jaxws-undertow-httpspi/main/jaxws-undertow-httpspi-1.0.1.Final.jar

java    4106  mmt  517r      REG              249,2     13048   16936336 /opt/seven/wildfly-14.0.1.Final/modules/system/layers/base/org/jboss/ws/jaxws-undertow-httpspi/main/jaxws-undertow-httpspi-1.0.1.Final.jar

In other instance that is running properly with same setup:

$ netstat -an | grep 8443

tcp        0      0 0.0.0.0:8443            0.0.0.0:*               LISTEN

$lsof -p 15350 | grep https

java    15350  mmt  mem       REG              249,2     13048   16973197 /opt/seven/wildfly-14.0.1.Final/modules/system/layers/base/org/jboss/ws/jaxws-undertow-httpspi/main/jaxws-undertow-httpspi-1.0.1.Final.jar

java    15350  mmt  417u     IPv4         3743045405       0t0        TCP *:pcsync-https (LISTEN)

java    15350  mmt  520r      REG              249,2     13048   16973197 /opt/seven/wildfly-14.0.1.Final/modules/system/layers/base/org/jboss/ws/jaxws-undertow-httpspi/main/jaxws-undertow-httpspi-1.0.1.Final.jar

What could be the root cause for this behaviour and how to avoid it?

Thanks in advance