Network Error: 404 Not Found on ScriptResource.axd and WebResource.axd Updated September 08, 2017 20:51 DescriptionThe sites seem to work without any visible issues. The Event Viewer on the server reports 404s on the ScriptResource.axd and WebResource.axd files. CauseThis is an issue with machine keys in a load balanced environment. ResolutionThe recommendation is to standardize the machine keys on all the servers in the load balanced configuration. The instructions for modifying the keys can be found here . The key is to apply the same IDs to all the servers in the configuration.