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    By David Crowther

    faq-MapThat___What_is_causing_the_Http_Error_503-1.PNG

    Question:

    What is causing the Service Unavailable – HTTP Error 503 – message when I open MapThat and try to view icons?

    faq-MapThat___What_is_causing_the_Http_Error_503-2.png

    Answer:

    This error message could be related to the Application Pool that the MapThat Instance is using.

    For example, if MapThat opens and successfully loads a Project, but the ICONS do not display:

    faq-MapThat___What_is_causing_the_Http_Error_503-3.png 

    And if you try to simply render one Icon in a browser window using the URL path to the icon on the server, and you also see the same message:

    faq-MapThat___What_is_causing_the_Http_Error_503-4.png

    This could mean that the Application Pool for MapThat has stopped. So open IIS on the server and restart the Application Pool.

    faq-MapThat___What_is_causing_the_Http_Error_503-5.png

    The Icon will now display in the browser window:

    faq-MapThat___What_is_causing_the_Http_Error_503-6.png 

    And the Icons and Images will now also render in MapThat.