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RADIUS LB on ADC isn‘t using any cerificate? The cert is on the NPS itself, so I think you need to change it there.

Yep, that’s probably the easiest. Maybe I could try a suggestion from @Daniel Weppeler and use a standard TCP LB instead of RADIUS LB, there it should be possible to bind a certificate.

Rene, I‘m sorry but RADIUS is typically UDP and not TCP, so I would say it‘s not really possible. You can try an UDP/ANY LB.

You can't really LB Radius but you can use a VIP, I'm doing it and it works for a while now, there is a RADIUS protocol in NS on port 1812. LB Method is TOKEN with expression CLIENT.UDP.RADIUS.USERNAME and persistence set to Others (NONE). I've got a service with 1 of the RADIUS server bound and another service with the other Radius server as backup virtual server. So no LB but HA for Radius.