RDP session opens then closes for new server setup

I've setup a new server in PMP but when we try and RDP with auto logon it just opens and closes.

Change password and verify password work. I can RDP from the PMP to the server with the same account perfectly fine just not via PMP (in chrome) other server all still work. This was in the log:

[09:58:48:894]|[04-24-2018]|[com.toremote.ce]|[SEVERE]|[1163]: java.lang.RuntimeException: Could not generate DH keypair|
com.toremote.fa: java.lang.RuntimeException: Could not generate DH keypair
at com.toremote.gx.a(SourceFile:375)
at com.toremote.gx.a(SourceFile:250)
at com.toremote.fc.a(SourceFile:9138)
at com.toremote.ce.run(SourceFile:146)

Any pointers ?