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Diameter: Receiving 4001 in SLA on Sy interface?

+1 vote
1,245 views

Am trying to integrate between PCRF & OCS of different Vendors using an Sy interface. Policy configuration and integration is fine but for some of the cases am getting a 4001 (Diameter_Authetication_Rejected) in SLA.

As I understand, Authentication is not part of Sy interface. Can anyone let me know the possible scenarios where the 4001 RC can occur on an Sy interface.

posted Jul 6, 2015 by Prashanth P

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most likely invalid password :)
commented Jul 6, 2015 by Salil Agrawal
But in SLR no password is present
commented Jul 6, 2015 by Prashanth P
I have checked the base protocol 6733 and this is what it is saying
 DIAMETER_AUTHENTICATION_REJECTED 4001
      The authentication process for the user failed, most likely due to
      an invalid password used by the user.  Further attempts MUST only
      be tried after prompting the user for a new password.
commented Jul 6, 2015 by Salil Agrawal
However it is true that SLR does not have any password parameter so may be some more information needed to comment anything :)
commented Jul 6, 2015 by Salil Agrawal
Right... Sy does not do authentication.  Pls let know what other information you are expecting.
commented Jul 6, 2015 by Prashanth P
This is the information set for SLR -
<SL-Request> ::= <Diameter Header: 8388635, REQ, PXY >
 < Session-Id >
 { Auth-Application-Id }
 { Origin-Host }
 { Origin-Realm }
 { Destination-Realm }
 [ Destination-Host ]
 [ Origin-State-Id ]
 { SL-Request-Type }
 *[ Subscription-Id ]
 *[ Policy-Counter-Identifier ]
 *[ Proxy-Info ]
 *[ Route-Record ]
 *[ AVP ]
commented Jul 6, 2015 by Salil Agrawal
Here are the messages.

Transmission Control Protocol, Src Port: 36480 (36480), Dst Port: 3868 (3868), Seq: 1, Ack: 1, Len: 168
Diameter Protocol
    Version: 0x01
    Length: 168
    Flags: 0xc0
    Command Code: 8388635 Spending-Limit
    ApplicationId: 3GPP Sy (16777302)
    Hop-by-Hop Identifier: 0x05200941
    End-to-End Identifier: 0xa4525761
    [Answer In: 4]
    AVP: Session-Id(263) l=28 f=-M- val=test1;358057;1833;88
    AVP: Auth-Application-Id(258) l=12 f=-M- val=3GPP Sy (16777302)
    AVP: SL-Request-Type(2904) l=16 f=VM- vnd=TGPP val=INITIAL_REQUEST (0)
    AVP: Subscription-Id(443) l=40 f=-M-
    AVP: Origin-Host(264) l=13 f=-M- val=test1
    AVP: Origin-Realm(296) l=15 f=-M- val=test1.com
    AVP: Destination-Realm(283) l=20 f=-M- val=replaced.com
   
   

Transmission Control Protocol, Src Port: 3868 (3868), Dst Port: 36480 (36480), Seq: 1, Ack: 169, Len: 120
Diameter Protocol
    Version: 0x01
    Length: 120
    Flags: 0x40
    Command Code: 8388635 Spending-Limit
    ApplicationId: 3GPP Sy (16777302)
    Hop-by-Hop Identifier: 0x05200941
    End-to-End Identifier: 0xa4525761
    [Request In: 1]
    [Response Time: 0.046002000 seconds]
    AVP: Session-Id(263) l=28 f=-M- val=test1;358057;1833;88
    AVP: Result-Code(268) l=12 f=-M- val=DIAMETER_AUTHENTICATION_REJECTED (4001)
    AVP: Origin-Host(264) l=28 f=-M- val=xyz.replaced.com
    AVP: Origin-Realm(296) l=20 f=-M- val=replaced.com
    AVP: Auth-Application-Id(258) l=12 f=-M- val=3GPP Sy (16777302)
commented Jul 6, 2015 by Prashanth P
Sorry no clue, everything looks ok to me. Please debug the peer to know what is happening :)
commented Jul 6, 2015 by Salil Agrawal
Thank you for trying :-)
 In any case if you come across such issue or a similar... please share the information
commented Jul 6, 2015 by Prashanth P
Will luv to share the info

:)
commented Jul 6, 2015 by Salil Agrawal
Hi Prashanth,

Went through the Spec  http://www.etsi.org/deliver/etsi_ts/129200_129299/129219/12.03.00_60/ts_129219v120300p.pdf may be u can try with the complete set of desired AVPs required for SLR. From Spec what I found SLR message contains below AVPs
<SL-Request> ::= <Diameter Header: 8388635, REQ, PXY >
 < Session-Id >
 { Auth-Application-Id }
 { Origin-Host }
 { Origin-Realm }
 { Destination-Realm }
 [ Destination-Host ]
 [ Origin-State-Id ]
 { SL-Request-Type }
 *[ Subscription-Id ]
 *[ Policy-Counter-Identifier ]
 [ Logical-Access-ID ]
 [ Physical-Access-ID ]
 *[ Proxy-Info ]
 *[ Route-Record ]
 *[ AVP ]

Out of these above AVPs Policy Counter Identifier is a Mandatory AVP for SLR. Also when I checked the spec for Transient Failure and Permanent Failure no scenario I can able to corelate with the 4001.
commented Dec 10, 2015 by Chinmoy Padhi

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