NPS- MFA loop after Windows Server update

[NikFal]

Hello, 

I have patched my Windows server 2019 to the latest MS update. All of a sudden, my MFA stuck in a loop. 

I was keep getting the Approval on my Phone for the VPN and each time i approve, it comes again and i cannot login. 

On the FW Side it shows  

"RADIUS servers not responding"

Is there any known issue for this ? Because after I restore it from snapshot it worked fine. 

[PhoneBoy · Accepted solution]

The issue is related to Blast RADIUS (CVE-2024-3596).
See: https://support.checkpoint.com/results/sk/sk182516 
As Remote Access isn't yet fixed for this issue, you'll probably have to apply the solution from: https://support.checkpoint.com/results/sk/sk42184