IIS7.5 ASP.NET MVC users hitting strange URLs: /(F(1xe9eXIxPz?

Take a look at Understand How the ASP. NET Cookieless Feature Works.

Take a look at Understand How the ASP. NET Cookieless Feature Works: In V2.0, Anonymous Identification and Forms Authentication also use this feature. The URL may now look like this: MySite.com/MyWebApplication/(A(XXXX)S(XXXX)F(XXXX))/home.

Aspx and further down: F(XXXX): This is the Forms Authentication ticket. Probably some of your clients block cookies. EDIT: That said, that URL you've posted seems excessively long.

Maybe the MVC internals or the URL rewriting interact with it badly for whatever reason. Question MVC2 Cookieless Session Issue using POST might be somewhat related. EDIT2: This thread seems to also be related to your problem: http://forums.asp.net/t/1612673.aspx.

The author mentions that some users are reporting http 400 errors because apparently some users are getting forms auth tokens that are longer than normal, since these are passed in the URL they are making the URL length longer than IIS will accept Might be a long shot, but worth a try.

Aha! From your link: "If the combination of the anonymous identification ticket, forms authentication ticket, session ID, and user data is greater than the maximum permissible URI length, the request will fail with a 400-Bad Request error. " – Andrew Bullock Jun 3 at 16:31 how do I cause this mode to be used so I can test?

Just disabling cookies in FF doesn't cause it... – Andrew Bullock Jun 3 at 16:32 True, but in the URL you posted there seems to be only the forms auth ticket, which shouldn't be that long... – Jakub Januszkiewicz Jun 3 at 16:40 its >300, 260 is the limit apparently. Bloody MS – Andrew Bullock Jun 3 at 16:44 Try to delete all cookies (from your domain), disable cookies altogether and try to authenticate in your application. If that doesn't trigger it then I think you'll need to get creative ;-) Knowing what browser your users use would probably help a lot.

– Jakub Januszkiewicz Jun 3 at 16:49.

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