Citrix VPX not a valid Radius server

Hello, I am running privacyIDEA 3.6.3 on Ubuntu 20.04
I am currently using it to provide 2fa Radius to a FortiGate firewall for VPN.
I am trying to add a Citrix VPX/NetScaler to use this as well. I went into nano /etc/freeradius/3.0/clients.conf and added an entry for the NetScaler IP. I also tried replacing the entry that was already there for the FortiGate. When I enter the IP and Secret into the net scaler i get the following error.

Server ‘’ is reachable.
Either ‘’ is not a valid Radius server
‘1812/udp’ is not a valid Radius authentication port or Radius client is not configured properly in the Radius server.

Any help would be appreciated.

After config you need to restart the RADIUS server.

I would recommend to run the RADIUS server in debug, to see if anything arrives there. Probably a networking, routing, firwall issue.

Which IP address did you configure as a RADIUS Client?
Unless you are load-balancing for the RADIUS backends, the communication from the NetScaler will come from the NSIP.

If you need help specifically with the configuration of NetScaler, I can be of assistance.