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When trying to access a ArcIMS image service using ArcPad, ArcPad crashes with an error window titled "JPEG Library Error" stating:
"Not a JPEG file:"
ArcPad expects JPEG images from ArcIMS map services. This error occurs when the ArcIMS map service returns a different type of output image, such as PNG.
As a precaution, ArcPad's requests automatically include the <OUTPUT> tag, which allows ArcPad to specifically request a JPEG image, regardless of the type of image the map service usually produces. However, by default the <OUTPUT> tag is blocked by the ArcIMS server as a security measure.
Please note: The solution to this issue must be done on the ArcIMS server! There is no client-side solution for this error.
Administering the ArcIMS Servlet Connector
ArcIMS Servlet connector properties
spatialServer.AllowResponsePath can be left as False