Hi,I used freeradius-server-4.0~alpha1 to use the tacacs virtual server, but I encountered some problems when I used the ppp authencation. Here are the debug info : (33) User-Name = "66" (33) Client-Port = "va100-0" (33) User-Password = "666" (33) tacacs - Running 'authenticate PAP' from file /usr/local/etc/raddb/sites-enabled/tacacs (33) tacacs - authenticate PAP { (33) pap - Login attempt with password (33) pap - ERROR: No "known good" password found for user I searched such problem and most of them say it is due to not setting the users file.(but I actually did it!) My configure steps are as followed: 1) A brand-new config dictionary. 2) CP tacacs from site-available to site -enable,while setting the secret. 3) Delete default in sites-enable. 4) Some modification to inner-tunnel ,I did not use that ,just to run the radius. 5) Add client in clients.conf(I think I need not do that but it does not matter). 6) Add 66 Password.Cleartext := "666" in the users file. I think maybe I should do step(6) in other places? But i did not find any doc,problem, or example show how to do it . Actually, I tried every method like pap ,chap ,mschap and got the same result. Thanks a lot for your help!!! 黄立成 2071264258@qq.com