Using the wireless functionality of the Cisco 877W router I discovered that the wireless connection being disconnected en reconnected intermittently. At fist I thought it might be my Linux notebook doing wierd things, but as other wireless clients acting the same I suspected my new broadband router. Looking at the router log it appears that Cisco IOS reports “CCKM authentication failed”, in which CCKM stands for Cisco Centralized Key Management.

%DOT11-7-CCKM_AUTH_FAILED: Station 0016.44d7.xxxx CCKM authentication failed

So I started searching the web for this particular error message. As I found out more people have reported it and some were suggesting raising the broadcast key change interval, but that didn’t work for me. Also downgrading the IOS software was mentioned, but hey I don’t like to downgrade so I upgraded to a more up to date IOS version and the problem seems to be fixed! The last two days since the upgrade there are no more annoying dis- and reconnects. It starting to look like Cisco has done a good job!

I did the upgrade from IOS version c870-advipservicesk9-mz.124-22.T.bin to c870-advipservicesk9-mz.124-24.T1.bin.

Beware of IOS version c870-advipservicesk9-mz.124-24.T.bin, this one seems to be unstable.

This will most certainly apply to the complete Cisco 870 series.