JPEG Library Error: Not a JPEG file

Error Message

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:"

Cause

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.

Solution or Workaround

1. Review the ArcXML Programmers Reference Guide for more information on the <OUTPUT> tag and its security restrictions. Also check the ArcIMS Help under
   

   Using ArcIMS
       Administering the ArcIMS Servlet Connector
       ArcIMS Servlet connector properties
         Properties
           spatialServer.AllowRequestOutput 

   
   
2. Following the guidelines in the documentation mentioned above, modify the Esrimap_prop file setting as shown here:
   

   Code:
   spatialServer.AllowRequestOutput=True

   
   
   

   Note:
   spatialServer.AllowResponsePath can be left as False

   
   
3. Save and close the modified Esrimap_prop file.
4. Stop and restart your webserver to make the modification take effect.