Hi, Is there another attribute syntax on radclient that could be used aside from Acct-Session-Id to perform COA to a session We are using MultilinkPPP (single session per bundle still) and it is not working as it normally would with PPP. Thanks, Jay RADIUS: COA received from id 48 x.x.x.99:1052, CoA Request, len 149 COA: x.x.x.20 request queued RADIUS: authenticator 70 8D C4 4D 97 82 50 02 - 73 6B 53 27 81 52 29 BD RADIUS: User-Name [1] 25 "user1@5_6_mlp.com1" RADIUS: Acct-Session-Id [44] 10 "000110A4" RADIUS: Vendor, Cisco [26] 46 RADIUS: Cisco AVpair [1] 40 "ip:sub-qos-policy-in=policy_session_in_coa" RADIUS: Vendor, Cisco [26] 48 RADIUS: Cisco AVpair [1] 42 "ip:sub-qos-policy-out=policy_session_out_coa" COA: Message Authenticator missing or failed decode ++++++ CoA Attribute List ++++++ 7FD2EA5DA700 0 00000009 username(447) 23 user1@asr_5_6_mlp.com1 7FD2EA5DB090 0 00000001 session-id(409) 4 69796(110A4) 7FD2EA5DB0A8 0 00000009 sub-qos-policy-in(421) 17 policy_session_in_coa 7FD2EA5DB0C0 0 00000009 sub-qos-policy-out(423) 18 policy_session_out_coa RADIUS/ENCODE(00000000):Orig. component type = Invalid RADIUS(00000000): sending RADIUS(00000000): Send CoA Nack Response to x.x.x.99:1052 id 48, len 157 RADIUS: authenticator 76 2F 9A 52 29 2C 26 57 - 27 F6 E0 CC A6 E6 F1 13 RADIUS: User-Name [1] 25 "user1@5_6_mlp.com1" RADIUS: Vendor, Cisco [26] 43 RADIUS: Cisco AVpair [1] 37 "sub-qos-policy-in=policy_session_in_coa" RADIUS: Vendor, Cisco [26] 45 RADIUS: Cisco AVpair [1] 39 "sub-qos-policy-out=policy_session_out_coa" RADIUS: Reply-Message [18] 18 RADIUS: 4E 6F 20 76 61 6C 69 64 20 53 65 73 73 69 6F 6E [ No valid Session] RADIUS: Dynamic-Author-Error[101] 6 Unsupported Service [405]