Instance, users and permission

   Hi all,

  I have an issue. I am working on ax 2012. on the same instance 10 users are using them.

 my issue is that, i have changed few priviledges for a role. each user having system administrator privilege?

the problem is, one instance, i am working on dev environment is not working. nine others users are still using the same instance to work.  2 days before this problem started and whenever i work it shows the message.


1. Failed Login

2. Server unavailable

3Client has stop working.


Anyboody know, about the issues and solutions. kindly share the details.


Other users are able to work on their instance .