I have problems with forms authentication when I test my pages with IIS (localhost).

When I use the built-in webserver of VWD (Cassini, localhost:1234), it works fine.

In IIS, I can't log in, and I get this message in the eventlogs: "Membership credential verification failed".

I'm using the default membership database ASPNETDB.
I already gave read/write access to the App_Data folder for the ASPNET user.

Any help is appreciated.

you might want to verify you have applicationname set to something besides / in your web.config.  That's often a reason for the problem on iis.

Thanks! Your post was a great help!

pretty common problem.  we've all run into it.

I just wrote a blog about it so hopefully more people will find the answer easily.

 
http://peterkellner.net/2006/10/20/loginfailswithiisnotcasini/

 

You might also see this error if you have a custom membership provider and it does not have access to the underlying database. I recreated my database and was unable to login, having forgotten to add the specified user permissions to the database. Adding the correct user as db_owner solved the problem. Regards Ben