This is my Global.asa file I think the problem is here:

<OBJECT RUNAT=Server SCOPE=Session ID=OggettoDB PROGID="ADODB.Connection"></OBJECT>

<SCRIPT LANGUAGE=VBScript RUNAT=Server>
sub Session_OnStart
    OggettoDB.Open "driver={MySQL ODBC 5.1 Driver};server=XXX;User=XXX;PWD=XXX;database=studiorolle_it_catdb;option=3"
    Application.lock
    Application ("inlinea") = Application ("inlinea") + 1
    Application.unlock
end sub
sub Session_OnEnd
    Application.lock
    Application ("inlinea") = Application ("inlinea") - 1
    Application.unlock
    session("utente") = ""
    session("password") = ""
    OggettoDB.close
end sub
</SCRIPT>