topic Re: ISE 2.6 Patch 5: Macbook wireless fail using PEAP(MSCHAPv2) in Network Access Control

ISE 2.6 Patch 5: Macbook wireless fail using PEAP(MSCHAPv2)

KelvinT — Wed, 02 Sep 2020 17:10:19 GMT

ISE 2.6 patch 5

Macbook

Wireless connection: user authc, previous machine authc

Hello,

Do we know if there is still an issue with Macbook using PEAP(MSCHAPv2)?

I have some macbook successfully connect on ISE (user & Machine. i.e. user authc, successful previous machine authc) using LEAP but fail using PEAP(CHAPv2) stating below.

	24715	ISE has not confirmed locally previous successful machine authentication for user in Active Directory
	24714	ISE peers have not confirmed previous successful machine authentication for user in Active Directory

Thanks

Re: ISE 2.6 Patch 5: Macbook wireless fail using PEAP(MSCHAPv2)

Greg Gibbs — Wed, 02 Sep 2020 22:58:51 GMT

Mac OSX does not really have the same separate Computer/User states as Windows. They also do not have the native ability to join an AD domain, so I'm not sure how you have machine auth happening against any MacBooks.

Where I've seen customers using PEAP-MSCHAPv2 with MacBooks, they considered them single-user devices, used JAMF Pro to enrol and configure the Network Profile with the user credentials, and only authenticated against the user credentials.

From the logs you provided, I would also infer you are trying to use MAR (WasMachineAuthenticated = True)? If that's the case, I would strongly recommend against using MAR as it has known user experience issues with Windows PCs. I don't know that MAR has ever even been tested with OSX as it does not have a clear separation of Computer/User states.

Machine Access Restriction Pros and Cons

Re: ISE 2.6 Patch 5: Macbook wireless fail using PEAP(MSCHAPv2)

KelvinT — Thu, 03 Sep 2020 10:20:42 GMT

Hi Greg,

Thanks for you respond.

We are receiving a user and machine authc from the macbook configured with LEAP but not macbooks configure with PEAP(MSCHAPv2). Doing some search I see old conversations about ISE/Macbook/PEAP(MSCHAPv2) issues which is why I asked.

I'm not an apple/macbook tech so my knowledge is very limited. I can say I see on the ISE logs actually similar behavior as EAP-FAST. The user and machine is sent in the same log and MARS is used for those macbooks configured with LEAP.

Side note: I am aware of the limitations with MAR. Someone gave me a very good workaround. Switch user causes the machine to reauthc every time. So every time switch user is selected I see machine authc on ISE. The user can log back in and get connected. So just selecting switch user (no additional log in is required) then the same user logs back in is the best workaround.

Thanks again Greg