NAV 2009 Vs NAV 2013 Web Services (WS) Technology  NAV 2009 Security for Web Services (WS) in NAV 2009 is managed by using Windows Authentication. This is the reason access to NAV 2009 Web Services requires the user to log into a domain and be a valid Windows Login in NAV. Consequently, this is also why the user accessing the Web Services URL receives a login prompt when the SPNs/delegation is not setup properly. All the SPN/delegation setup allows the NAV Service (either RTC o 
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