Error “Concurrent number of AOS for this application Exceeds the licensed number”

Error “Concurrent number of AOS for this application exceeds the licensed number”

When we try to start the service of Ax2009 instance it fails and throws an error “Concurrent number of AOS for this application Exceeds the licensed number” in the event log.  To resolve the issue, follow below steps

•  Open SQL Server Management Studio and select the Dynamics Ax database used for the instance.
•    Select New query

select * from dbo.sysserversessions where status = 1

• Change the value by running following query

            update dbo.sysserversessions set status = 0 where status = 1

           Now you should be able to start AX2009 service.