This is a problem a few of us have experienced with snow, and there is a 
discussion on the R-hpc list about this. No solution yet, as far as I 
can tell.

Abhijit
On 9/7/2010 9:18 AM, bfoubert wrote:
> I'm working with snow and created a local cluster. So far, the same code has
> always worked (please see below). However, now I receive a message that the
> connection with the nodes cannot be opened. I restarted my workstation but
> that didn't help. Is there a known solution for this problem? Thanks a lot
> for any help.
>
> bram foubert
>
>
> library(snow)
> cl =
> makeSOCKcluster(c("localhost","localhost","localhost","localhost","localhost","localhost","localhost"))
> nrslaves = length(cl)
>
> CreateData= function(path){
> ...
> }
>
> clusterApply(cl,c("bgcdata1.txt","bgcdata2.txt","bgcdata3.txt","bgcdata4.txt","bgcdata5.txt","bgcdata6.txt","bgcdata7.txt"),CreateData)
> Error in checkForRemoteErrors(val) :
>    7 nodes produced errors; first error: cannot open the connection
>
>    

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