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In Mono 4.2.2 using forms authentication with persistent cookie, cookie lifetime is set always to 50 years in line
starting at .NET 2.0 timeout element value must used for this.
This means that in ASP.NET 2.0 the timeout value of both persistent and session based cookies are controlled by the timeout attribute on the <forms/> element. This also applies if you migrate an ASP.NET 1.1 application to ASP.NET 2.0 then you can expect your persistent cookies to be reduced from 50 years to 30 minutes unless you increase the value in the timeout attribute.
This should be fixed on Mono master.