Error while starting MSD Ax 2009 Instance

If you are facing below error while  while starting Ax 2009 Instance.

"Concurrent number of AOS for this application Exceeds the licensed number".

It means you have single AOS license but You have installed multiple AOS and trying to access using load balancing.

You can solve your error following way.

Open sql query editor and do following steps

SELECT * FROM dbo.SysServerSessions WHERE Status = 1;

Change the Status value by using following  update query:

UPDATE  dbo.SysServerSessions SET Status = 0 WHERE Status = 1;