HP Thin Client running Windows Embedded don't profile with attributes DHCP

My company has a large population of HP Thin Clients that are not attached to our AD domain and therefore cannot do dot1x because they have no certificates.

We decided to do the profiling for these devices. We present a few attributes, two of these DHCP attributes.

About 90% of our profile of thin clients, as expected, but the other 10% will refuse to work. We need to statically assign them to a group of identity to authenticate properly.

A lot of troubleshooting reduced us to query DHCP the thin client sent was not received by the strategy node. A TAC engineer looked over the config switch, IP helper address configuration and said that everything seems to be configured correctly.

The only explanation is that it seems that these specific thin clients were not finishing the DHCP process before reassigned switch the VLAN of the port. So when the dhcp request has been sent, the thin client was already in our vlan "invited" who does not dhcp to the ISE.

It's very strange, because we have so many thin clients that works properly. It's only a handful that do not. We have not been able to further refine to something specific. They are running Windows Embedded Standard 7 and a majority of them are HP t5740. I don't see Windows or HP updates available for these units and not sure if there are any registry hacks available to expedite the DHCP process.

Has anyone ever come across something similar to this?

It's pretty obvious to me, the end point isn't you get profiled before there was authenticted, which means that you do not correspond to the profiling conditions defined in rules 6 and 7, which means it will match the rule 11 (I think, having not seen your real rules). What I expected this, is that endpoint gets profiled, if ISE receives the attributes of this endpoint via dhcp e.g. forwarding help. Then, what should happen is, that it should issue a certificate of authenticity to the switch, which will lead to the passage to be re - authenticate this ending point, which now must have customization attributes you are trying to match. However if the DHCP packet never reaches ise, it won't work. That's why I think you should do a trace of package on the ise server, to see if the packets actually reach ise. If they don't you will probably need to find another way to profile, or activate dhcp for assistance on your guest virtual local network. Have you looked at the attributes of endpoint maybe after 30 seconds? They change?

Tags: Cisco Security

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