We have ArcGIS Server (AGS) running with 2 nodes. When I query the map service layer, using a simple True statement such as 1=1, on ONLY on one of the nodes, it returns a SEVERE error stating "An invalid where clause or definition expression has been requested: "1=1". The other node returns valid results. The service is configured with "Use Standardized Queries: true"; also, if that was an issue, both nodes would be throwing the same error.
I would expect both server nodes to behave the same way