Concurrent number of AOS for this application Exceeds the licensed number while starting AOS, dynamics ax 2012 R3

while starting AOS I got below error
"Concurrent number of AOS for this application Exceeds the licensed number"


for this follow work around
 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

hope this helps