Follow document of your choosed application server to enable https. By default, QuickBuild runs on top of tomcat which is available in the tomcat sub directory under the QuickBuild installation directory. Document of configuring https for tomcat can be found here.

Edit web.xml (by default, it is located in directory <QuickBuild install dir>/web/WEB-INF) to uncomment below section:

<security-constraint>
  <web-resource-collection>
    <web-resource-name>all</web-resource-name>
    <url-pattern>/*</url-pattern>
  </web-resource-collection>
  <user-data-constraint>
    <transport-guarantee>CONFIDENTIAL</transport-guarantee>
  </user-data-constraint>
</security-constraint>

Change to administration menu, and update value of QuickBuild servlet URL system setting to reflect the https url.

For client applications using QuickBuild's remote API, if the exception SSLHandshakeException is thrown with message "unable to find valid certification path to requested target", please follow instructions here to trust certificate of https-enabled QuickBuild server.

For QuickBuild instances (could be the same QuickBuild instance as the https-enabled one) who interacts with the https-enabled instance, if the exception SSLHandshakeException is thrown with message "unable to find valid certification path to requested target", please follow instructions here to trust certificate of https-enabled QuickBuild server. Below is some examples of the interations: