WAAS Express devices went offline in Central manager

Hi all,
after a long time i have a new issue in our WAAS environment.
We're running several WAAS Express devices.
And a few weeks ago i integrated them into our WAAS Central Manager.
The registration of WAAS Express device was done on basis of "waasx_deployment_guide_120910.pdf"
Now when i came back from christmas holiday i detected that all of them became offline again in CM.
Activating as well as replacing did not work, cause the router detected that the device is still registered.
i got the following output after this:
Jan 10 15:30:37: %WAAS-3-WAAS_CM_REGISTER_FAILED: IOS-WAAS registration with Central Manager failed for the following reason: Registration r
ecord for this device already exists or other devices share certificate or mac address or ip address with this device. Failed to process reg
istration request initiated from 10.11.176.1
Jan 10 15:30:37: %WAAS-3-WAAS_CM_REGISTER_FAILED: IOS-WAAS registration with Central Manager failed for the following reason: Registration r
ecord for this device already exists or other devices share certificate or mac address or ip address with this device. Failed to process reg
istration request initiated from 10.11.176.1
Now to my questions:
How can i set the WAASxpress router to Status active again on CM?
What could be the reason why the WAAS express device became offline?
thanks for your feedback in advance
Dieter

Hi Dieter,
i am just curious to know what made the WAAS express go offline. Even if you open a TAC case, TAC is going to ask this question.
1. Was there any IOS upgrade performed on routers?
2. Was the routers reloaded for any reason?
3. If you are using AAA / TACACS, any changes like upgrade / renewal of certificates on them?
This information will help you narrow down the problem quickly. If you can share above information, we might be able to move something for you.
Regards.

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