ISE authentication fail during windows re-logon

Question

Background:
Deployed a Cisco ISE 1.1.2. that is used to authenticate and posture validate for wired users, attached to Cisco IP Phones. Backend database is Microsoft AD.
Problem:
At the first time both, users and IP Phones, pass authentication and posture validation steps successfully. When the user logs off from windows, the log off is done whithout any problem, and I can see it switch.
The problem takes place when the user try to log on again. The ise does not match the configured authenticion rules as in the first time, and put the user directly to default "DenyAccess" policy (rule).
Anyone out there experienced something similar or have any ideas on why this is happening?
Thanks.

Answer 1

Hi
Possible Causes
• This could be either a MAB or 802.1X authentication issue.
• The authorization profile could be missing the Cisco av-pair=”device-traffic-class=voice” attribute. As a result, the switch does not recognize the traffic on the voice VLAN.
• The administrator did not add the endpoint as static identity, or did not allow an unregistered endpoint to pass. create a policy rule to (“Continue/Continue/Continue” upon failure).
Resolution
• Verify that the Authorization Policy is framed properly for groups and conditions, and check to see whether the IP phone is profiled as an “IP phone”or as a “Cisco-device.”
• Verify the switch port configuration for multidomain and voice VLAN configuration.
• Add the continue/continue/continue to allow the endpoint to pass:
Choose Policy > Policy Elements > Results > Authentication > Allowed
Protocols to create a Protocol Policy. MAC authentications use PAP/ASCII and EAP-MD5 protocols. Enable the following MAB Protocols settings:
– Process Host Lookup
– PAP/ASCII
– Detect PAP as Host Lookup
– EAP-MD5
– Detect EAP-MD5 as Host Lookup
• From the main menu, choose Policy > Authentication.
• Change the authentication method from Simple to Rule-Based
• Use the action icon to create new Authentication Method entries for MAB:
– Name: MAB
– Condition: IF MAB RADIUS:Service-Type == Call Check
– Protocols: allow protocols MAB_Protocols and use
– Identity Source: Internal
– Hosts: Continue/Continue/Continue