Web AppBuilder for ArcGIS has arrived

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Web AppBuilder for ArcGIS is a powerful new application builder included as part of ArcGIS Online and Portal for ArcGIS. This article explains the important differences between the standard Web AppBuilder for ArcGIS and the Web AppBuilder for ArcGIS (Developer Edition).
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Problems Accessing Services After a Reboot When Running ArcGIS for Server on a VM

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If you are running ArcGIS for Server on a VM with the Web Adaptor installed, you might find that you are no longer able to access your services after a reboot. In some environments such as Amazon, the Web Adaptor is configured against the internal IP of the machine if it is not part of a domain. As this dynamically changes when the machine is rebooted, the Web Adaptor will need reconfiguring against this internal IP as it will have changed.
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Using OAuth2 App ID Authentication with ArcGIS Online Applications

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When using OAuth2 App-ID authentication with ArcGIS Online Applications, it is worth noting that the Feature Services being consumed by the application must be owned by the application author (the creator of the token). If the Feature Services are not owned by the application author, or are only shared to the application author, the user will receive an error.
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