topic Re: ISE : Active Directory integration long usernames sAMAccountname in Network Access Control

ISE : Active Directory integration long usernames sAMAccountname

tbostrom — Mon, 11 Mar 2019 03:49:24 GMT

Have a customer deploying ISE for wireless authentication using PEAP-MSCHAPv2. They've encountered an issue where some users with long usernames are failing authentication to ISE. ISE logs that the user is not found in the user database (Active Directory).

Upon further review, it appears that ISE is using the sAMAccountname as the username token to authenticate against.

sAMAccountname is limited to 20 characters.

Customer is running a full Windows 2008 domain and users login to the domain using their User Principal Name (no 20 character limit). Therefore, when the user creates a wireless connection and passes his Windows credentials to PEAP, it fails because the username is too long and ISE does not find user in AD database.

Is there a way to point ISE to use a different username token instead of sAMAccountname? or is this a known issue?

ISE : Active Directory integration long usernames sAMAccountname

Ravi Singh — Wed, 28 Aug 2013 02:12:52 GMT

I don't think there is any way to increase the limit of 20 characters. You have to create to user name with 20 characters limit.

Re: ISE : Active Directory integration long usernames sAMAccountname

tom.barat@dimensiondata.com — Fri, 25 Jun 2021 12:39:49 GMT

I ave the same issue with one of my clients.

Any chance this has been fixed in the last 7 years or someone found a workaround ?

Re: ISE : Active Directory integration long usernames sAMAccountname

victor.jaouen — Wed, 30 Jun 2021 14:17:53 GMT

Any update on this limitation ?

Re: ISE : Active Directory integration long usernames sAMAccountname

hslai — Mon, 05 Jul 2021 16:35:14 GMT

See

CSCvf21978 ISE failing to resolve ambiguity for AD accounts
CSCvc86398 ISE 2.1 patch 2 some certificate authentications fail

Re: ISE : Active Directory integration long usernames sAMAccountname

tom.barat@dimensiondata.com — Tue, 06 Jul 2021 10:00:05 GMT

Thank you for sharing these bugs.

They don't match exactly our issue (bugs mention issues for short usernames, we have issues with long ones) but it might help the TAC find the issue faster.

Have a nice day.

Re: ISE : Active Directory integration long usernames sAMAccountname

Andrii Oliinyk — Sun, 18 Jul 2021 09:33:08 GMT

Hi Tom

do u have any conclusions on the case with TAC? i'd highly appreciate.

Re: ISE : Active Directory integration long usernames sAMAccountname

tom.barat@dimensiondata.com — Mon, 19 Jul 2021 17:01:04 GMT

Hello,

No, i wanted to collect logs before opening the TAC case but the users running into this issue are on vacation currently.

I'll be sure to update once this is solved in our environment.

Have a nice day,

Best regards.

Re: ISE : Active Directory integration long usernames sAMAccountname

CiscoU9834 — Wed, 02 Oct 2024 14:15:59 GMT

Hi, any news about this issue?