Occasionally on app restart this error will occur:
System.Configuration.ConfigurationErrorsException - System.Web, Thread was being aborted.
(C:\Inetpub\web.config line 417)
at System.Web.Security.Membership.Initialize()
at System.Web.Security.Membership.get_Provider()
...
When it does the app needs to be restarted to clear the error, every page request after this raises the same bug. Line 417 is the Membrship provider add line in web.config. We're using the UpmMembershipProvider from MS Commerce Server, but it doesn't seem to be hitting this code, it's dying on the ConfigurationErrorsException inside System.Web.Security.Membership.Initialize() before it tried to instantiate the UpmMembershipProvider. If it was an error inside UpmMembershipProvider I'd expect to see it inside the stacktrace.
What can cause System.Configuration.ConfigurationErrorsException - System.Web, Thread was being aborted. to be raised?
Is the configuration by any chance redirecting the response?
Server.Transfer and Response.Redirect can cause a ThreadAbortedException.
来源：https://stackoverflow.com/questions/2218789/configurationerrorsexception-thread-was-being-aborted-on-membership-provider