I have followed the directions for scaling at http://bitbucket.org/galaxy/galaxy-central/wiki/Config/WebApplicationScaling, trying both the single job-runner/single web-server and single job-runner/multiple web-server approaches. In both cases, uploading data from UCSC failed with the following error message: An error occurred running this job: The remote data source application may be off line, please try again later. Error: [Errno socket error] [Errno -3] Temporary failure in name resolution What does this mean? We have multiple web servers behind a load balancing switch. If I limit the number of web servers to one, then the data upload works. Must the remote data request return to the same server and port as it went out from? David Hoover Helix Systems Staff http://helix.nih.gov