I feel like I've tried the works on something that should be obvious but I'm stuck. Package snowfall used to run just great under debian etch (amd-64, 2x quad-core). After upgrading to lenny (debian 5, reinstalled from scratch), I haven't been able to get snowfall running again. Password-less ssh works fine to localhost, its IP, or zero- config name. But when calling sfInit I invariably get this error message below. What puzzles me is that "ssh localhost" works without a hitch but the socket connection fails. Any suggestions would be greatly appreciated. Best, Martin Error in socketConnection(port = port, server = TRUE, blocking = TRUE, : cannot open the connection In addition: Warning message: In socketConnection(port = port, server = TRUE, blocking = TRUE, : port 10187 cannot be opened Error in sfInit() : Starting of snow cluster failed! Error in socketConnection(port = port, server = TRUE, blocking = TRUE, : cannot open the connection Error in socketConnection(port = port, server = TRUE, blocking = TRUE, : cannot open the connection Calls: source -> eval.with.vis -> eval.with.vis -> sfInit Execution halted I've tried this with the stable debian version of R (2.7.1) as well as compiled from R-2.8.1 (with current snowfall) and the latest from sid (see below). platform x86_64-pc-linux-gnu arch x86_64 os linux-gnu system x86_64, linux-gnu status alpha major 2 minor 9.0 year 2009 month 03 day 20 svn rev 48169 language R version.string R version 2.9.0 alpha (2009-03-20 r48169) Martin Renner Postdoctoral Fellow School of Aquatic and Fishery Sciences University of Washington Seattle, WA 98195-5020, USA current address: Alaska Maritime NWR Homer, AK 99603, USA