When i test the connection of my NTS from NeoLoad i got a certificate error. How can i fix that?

I configured my NTS so it can be reached through HTTPS. In our company we use our own certificate signed by our own ROOT authorities. So when i check the connection from NeoLoad i get that error:

sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at com.neotys.nl.controller.at.c(at.java:366)
    at com.neotys.nl.gui.h.h.c.a(c.java:82)
    at com.neotys.nl.gui.h.h.c.doInBackground(c.java:63)
    at javax.swing.SwingWorker$1.call(SwingWorker.java:295)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at javax.swing.SwingWorker.run(SwingWorker.java:334)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

I know it's due to our certificate but how can i tell NeoLoad to trust it?