I have search a lot, but seems my problem is very specific. I have a server in wich it works, but this is a test server, (windows 2003), when i try to deploy it in another server it doesnt work. I look for softwares instalations in the test server, found a SP2, a security update of framework 2.0 and other updates of windows, but in the real server and other 2 its the same, maybe i should change of dll for the rewriting thing?