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The ArcWeb server throws the following error when a REST v2006 userID is used with REST v2006.1:
"The server encountered an internal error (Invalid userid) that prevented it from fulfilling this request."
REST v2006 requests are automatically redirected to REST v2006.1, which is incompatible with v2006 userIDs.
Ensure that the REST v2006 userID has been regenerated for v2006.1. For more information, see REST v2006.1 authentication requests and parameters.