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** This issue is addressed in ArcSDE 9.0 Service Pack 2 (SP2) **
Various error messages returned when attempting to access certain Oracle Spatial layers. Sample error messages include:
"One or more layers failed to draw" from ArcMap or ArcCatalog.
"ArcSDE layers can not be retrieved" from ArcExplorer.
"NETWORK I/O OPERATION FAILED" when using SeLayer function to retrieve information on layer.
"java.lang.NullPointerException" when trying to access layer with SeConnection.getLayers()