ASUS RT-AC5300 problem with RADIUS

[mukkacow]

Hi all !!

Since this is my first post I would like to say thanks to everyone is writing here and I hope in future to be also helpful to other ppl.

I'm using RADIUS server on my RT-AC5300 via Synology DS716+ on local network but it think there is something buggy. At first all is working well and users can authenticate in Wi-Fi but after sometime it seems the router doesn't comunicate with RADIUS server and users cannot authenticate to the Wi-Fi. The problem occours also when I'm trying external RADIUS server like IronWifi.

I tested it with Asuswrt-Merlin stable v380.65_4 and also with latest beta v380.66_beta5.

Any idea of what could be problem and solve it?

Thanks you very much