Accounting server not reachable

[ivan_gonzalez_g]

Hi,

I have a vSZ-H controller with 80 AP installed. I use captive portal in Hotspot mode with an AAA external to my network. A year ago it is in operation. 3 days ago I stop authenticating users and can not access the Internet service. When reviewing the events Accounting server not reachable code 1602.
Thank you very much for the help.