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The layers within a map are 'projected-on-the-fly' if the data frame uses a coordinate system that is different then those of the layers. In certain cases, the features of an ArcIMS Service are lost after the coordinate system of the data frame is changed.
Older versions of ArcIMS (pre 9.0) use an older version of the Projection Engine. The Projection Engine identifies a coordinate system by an integer code. ArcMap uses these codes in order to make coordinate system requests on the ArcIMS server.
Therefore, the request from ArcMap may include codes that do not exist on the server, resulting in lost features.
There are two cases where the new codes cause problems when changing the coordinate system of the data frame.