cache problem : Need to click the logout button twice

[Jeff]

hi

asp.net 3.5

I need to click on the logout button minimum twice and sometimes many many
times (I stopped counting at 20).
Sometimes when logging in I have to enter the same password twice in order
to be authenticated...

The problem is caused by cache, atleast I removed my recently added cache
settings from the webpages and usercontrols and the problem was gone....

For example in the Default.aspx I have this cache setting:
<%@ OutputCache Duration="60" VaryByParam="None" Location="Client" %>

And the Login control which in my project is placed in the LoginControl.ascx
have this setting:
<%@ OutputCache Duration="60" VaryByParam="*" %>

any ideas what I do wrong here?