Failed connection to SSID (x) on AP (x) during association - error_code='55'

[EtienneSwart]

Good day everyone

I have some users on my Wireless LAN that are failing to connect to an SSID. This SSID is open with only Radius authentication.

The building is quite a dense Wireless network with a lot of AP's. 802.11r is enabled on the AP's as well.

The error code when looking from the Network Wide > Clients > Roaming point of view is: Failed connection to SSID (x) on AP (x) during association

When looking at the Meraki logs, the error code is as follows: auth_mode='wpa2-802.1x' 11k='1' 11v='1' ft='1' reassoc='1' error_code='55' radio='1' vap='0' channel='100' rssi='51'

Does anybody know what the cause of this error code might be? I have looked through all documentation and I can't find anything on error code 55.

Thanks in advance

Etienne 

[BlakeRichardson]

Is that access point setup on the radius server end as a NAS

[EtienneSwart]

Hi Blake. The AP's are all added to an ISE with all Users' credentials.

This issue is intermittent. There will be a lot of successful connections to an AP and then sometimes a user would fail to connect.

This happens at random with random users in the network and random AP's. I have not been able to replicate the issue with a specific user or a specific AP.

[DarrenOC]

Have you verified that all your AP’s are in the right subnet?

[EtienneSwart]

I have confirmed that all AP's are in the same subnet. All of their IP's are static and are added to ISE for authentication

[alemabrahao]

Try disabling the 802.11r.

While many customers enable 802.11r within their network without issue, some legacy devices may not connect to an 802.11r network. 802.11r is a recommended feature due to its many benefits, however a device audit is encouraged first to ensure that mission critical devices are not affected.

[UKDanJones]

This would be my advice too… or turn on ’adaptive’ - although I’ve seen this cause issues too but at least your Apple devices would still benefit. 

[RaphaelL]

Anything showing up from that page ? : 

Is the device able to connect or it fails at random times ?

[MattC1]

Are these Windows 10/11 devices that are connecting, then losing connection when roaming to a new access point?

[RaphaelL]

That + Intel NIC + MR29.XX firmware that would be my guess