I have 6 machines running the exact same version of the Linux client: 6.10.58. My two most-powerful machines stopped communicating with the WCG project servers properly about 10 days ago. The other 4 machines are fine.

It seems that communication of to WCG servers is fine. New tasks are being scheduled and a download list of tasks is being fetched by the client. However, the client cannot download any files on those 2 machines. When a task starts downloading, the elapsed time just increases, but no data is being received.

I've tried aborting all tasks, suspending the project, resuming it and forcing new tasks to be downloaded. Same result -> cannot download the actual tasks from WGC servers.

Error messages below:

Tue 16 Oct 2012 11:30:12 AM CDT Project communication failed: attempting access to reference site
Tue 16 Oct 2012 11:30:12 AM CDT World Community Grid Temporarily failed download of wcgrid_gfam_vina_6.12_i686-pc-linux-gnu: HTTP error
Tue 16 Oct 2012 11:30:12 AM CDT World Community Grid Backing off 1 min 0 sec on download of wcgrid_gfam_vina_6.12_i686-pc-linux-gnu
Tue 16 Oct 2012 11:30:12 AM CDT World Community Grid Temporarily failed download of wcgrid_gfam_vina_prod_linux.x86.6.12: HTTP error
Tue 16 Oct 2012 11:30:12 AM CDT World Community Grid Backing off 1 min 0 sec on download of wcgrid_gfam_vina_prod_linux.x86.6.12
Tue 16 Oct 2012 11:30:12 AM CDT World Community Grid Started download of wcgrid_gfam_gfx_prod_linux.x86.6.12
Tue 16 Oct 2012 11:30:12 AM CDT World Community Grid Started download of gfam_image01_6.12.tga
Tue 16 Oct 2012 11:30:13 AM CDT Internet access OK - project servers may be temporarily down.
Tue 16 Oct 2012 11:33:14 AM CDT World Community Grid Started download of wcgrid_gfam_vina_prod_linux.x86.6.12
Tue 16 Oct 2012 11:35:15 AM CDT Project communication failed: attempting access to reference site
Tue 16 Oct 2012 11:35:15 AM CDT World Community Grid Temporarily failed download of wcgrid_gfam_vina_6.12_i686-pc-linux-gnu: HTTP error
Tue 16 Oct 2012 11:35:15 AM CDT World Community Grid Backing off 1 min 0 sec on download of wcgrid_gfam_vina_6.12_i686-pc-linux-gnu
Tue 16 Oct 2012 11:35:15 AM CDT World Community Grid Temporarily failed download of wcgrid_gfam_vina_prod_linux.x86.6.12: HTTP error
Tue 16 Oct 2012 11:35:15 AM CDT World Community Grid Backing off 1 min 0 sec on download of wcgrid_gfam_vina_prod_linux.x86.6.12
Tue 16 Oct 2012 11:35:16 AM CDT Internet access OK - project servers may be temporarily down.


Any suggestions?