Try to change the Files Extensions ,
Instead of ".config" , use ".xml" or ".txt"
".config is a special extension, and maybe it causes the application to restart ,
To make sure that the application will is not restarting when you change one of those files,
run the application in debugging mode, and add a break point to application_start event in "global application file" ,
application start must called when the application starts , now modify one of those files , and refresh the page ,
if Application_start fired , then your application is being restarted every time you modify one of those files !
Also : you should make sure that the hosting company doesn't overrides one of the Session and FormsAuthentication configurations !
And the Most important thing is that you need to make sure that you application is configured as a virtual directory ,
so that you can configure your own security settings ( like using Forms Authentication, setting cookie timeout ...)