I have a classic ASP application which uses ServerVariables("Remote_User") to get the user login.
For some users it works fine, for some others it doesn't, and the weird thing is that it returns the "webpage cannot be found" error (I would expect a blank or null value instead...)
So I tested for those users other ServerVariables, and I found out that they get the same error for any variables in the collection.
Why just some users experience this problem? How can I get rid of it?
Please notice that Windows Authentication is enabled, Anonymous Authentication is disabled.

Any hint is appreciated,
thank you very much!