First of all I totally understand all your statements, I do not want to be rude or annoying, the SQL server is fixed since a long time and I am not looking for your help on my database but only to understand how FreeRADIUS works and interact in order to find a workaround. From what you said I understood from you both that in case of a blocked SQL databases the librairies does not allow FreeRADIUS to just consider the server as blocked and apply a timeout. Thank you for the idea of having two separates instances of FreeRADIUS one for detail files and one for SQL queries. FreeRADIUS is a great tool but as all tools that is sometimes not easy to use and users can ask help. It can also have problem: sometimes bugs sometimes not. I consider my problem as "work as design" because of the librairies not because of FreeRADIUS. I have now a better understanding on what happens. AL