On our CRM 4.0 Dev environment we experienced the following behaviour:
When opening CRM this message appeared:
The key specified to compute a hash value is expired, only active keys are valid. Expired Key : CrmKey…
After searching on the machine I found that the Async service did not run, I started it but restarting the Async service (full name Microsoft CRM Asynchronous Processing Service) didn’t fix it until I did an IISRESET, and this solved the issue.
There is also an alternative solution.
On the server (remote dektop) do the following “C:\Program Files\Microsoft Dynamics CRM\Tools >Microsoft.Crm.Tools.WRPCKeyRenewal.exe /R”