ASP.NET forms authentication encoded in URL

I am having trouble with I guess Forms Authentication..

Site runs perfect can login and log out.. but after a while (this is not a specific time frame) suddenly URLs start to look like this:

http://www.mydomain.com/(A(EvoNg_065oCKJ1l_AcU4ND7Uzkm05wugwbYu4jiKb-_24aJmbmE_r5djE-mw9b_3tvEBOLIH1f64rrtq6RZOSFto_o0MaN-3edRpjH2Bfn8uBnrUFhv2xmk4_9oLXHVEt-Dg5BfdPA3VprkCIixmbhr2KPs1))/Default.aspx

What does this encoding (A) mean... is it the authorization ticket or Anonymous user ticket or what is it. The funny thing is that it stays there and also include the encoding in all links on the page. Until at recycle the application pool for the site... when it is gone..... and it just starts over again after a while....

Anyone to point me in the right direction. Site is ASP.NET 4, using form auth and deployed on a IIS7

Please he开发者_JAVA百科lp...

Best regards

Henrik

This could be related to a cookieless session which you might have configured. Look for the following in your web.config:

<sessionState cookieless="true" />

Also checkout if cookieless Forms Authentication is not enabled.