I want to send disconnect-message to NAS using radclient program but when I want to disconnect one user using this command

echo user-name=zaib | radclient -x disconnect "muh"

the debug mod show this error

rad_recv: Disconnect-NAK packet from host port 3799, id=78, length=50
    Error-Cause = Unsupported-Attribute
    Event-Timestamp = "Jul  3 2017 09:35:01 +03"
    Message-Authenticator = 0xd52977c552ae0a7c83bb32c2acc6d195

I using fortigate as NAS I searched alot about this problem but I did not find solution

1 Answer 1


Check if attribute you are using is on that list: FreeRADIUS Attributes

  • thank you for your replay which attribute you mean I want to disconnect one user using above command Jul 3, 2017 at 6:56
  • update coa { User-Name = "%{User-Name}" Acct-Session-Id = "%{Acct-Session-Id}" NAS-IP-Address = "%{NAS-IP-Address}" } Jul 3, 2017 at 7:06
  • please help me @mrc02_kr Jul 3, 2017 at 7:35
  • According to link try to write attributes to file and then try to disconnect user. Maybe attributes are case sensitive and you need to type "User-Name=zaib" instead of user-name=zaib. I don't know for sure because I always type it with uppercase :)
    – mrc02_kr
    Jul 3, 2017 at 9:34
  • I writed the comman in upper case but the same result is appear Jul 3, 2017 at 11:00

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