Ax error " A user session on the server could not be created. Try to start the client again. If the problem continues contact Ax Administrator

Cause:
AOS has no access to createusersessions stored procedure in the database.
Even there will not be any log in Event Viewer for this issue.

Occurrence :
Whenever C:drive of AOS server gets full then this will occur.

Resolution:
Clear the C: drive at-least to 2 GB to run the application.
Best way is to shirk the SQL databases.

Regards,