For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

Dave_Mehlberg's avatar
Dave_Mehlberg
Icon for Cirrus rankCirrus
May 28, 2025

R-Series after upgrading to 1.8 - RADIUS Auth stopped working

Radius user authentication was working just fine while running v1.40.  After upgrading to 1.80 any attempt is "Failed authentication."   Running tcpdump does not show any traffic going to the RADIU...
authentication
os
radius
upgrade
VGF5's avatar
VGF5
Icon for Cumulonimbus rankCumulonimbus
May 30, 2025

Hi Dave,

Please check the following articles and this might help you out

https://techdocs.f5.com/en-us/f5os-a-1-5-0/f5-rseries-systems-administration-configuration/title-user-mgmt.html 

https://my.f5.com/manage/s/article/K000138598

After upgrading to F5OS 1.8.0, the RADIUS authentication process for the F5OS management interface (webUI) requires specific F5 Vendor-Specific Attributes (VSAs) to be present in the RADIUS server's response. If these attributes are missing, authentication will fail, and you may not see any RADIUS traffic in tcpdump if the system is not even attempting to send the request due to misconfiguration.