[Rd] Error in socketConnection(master, port = port, blocking = TRUE, open = "a+b", : cannot open the connection

Soumen Pal soumenpal1990 at yahoo.com
Fri Jan 15 08:05:21 CET 2016

Dear All

I have sucessfully created cluster of four nodes using localhost in my local machine by executing the following command

> cl<-makePSOCKcluster(c(rep("localhost",4)),outfile='',homogeneous=FALSE,port=11001)
starting worker pid=4271 on localhost:11001 at 12:12:26.164
starting worker pid=4280 on localhost:11001 at 12:12:26.309
starting worker pid=4289 on localhost:11001 at 12:12:26.456
starting worker pid=4298 on localhost:11001 at 12:12:26.604
> stopCluster(cl)

Now I am trying to create a cluster of 2 nodes (one in my local machine and another remote machine) by using "makePSOCKcluster" command. Both machine have identical settings and connected by SSH. OS is Ubuntu 14.04 LTS & R version 3.2.1. I have executed the follwoing command to create cluster but getting the following error message and R Session is getting hanged.

cl<-makePSOCKcluster(c(rep("soumen at",1)),outfile='',homogeneous=FALSE,port=11001)
soumen at's password: 
starting worker pid=2324 on soumen-HP-ProBook-440-G2:11001 at 12:11:59.349
Error in socketConnection(master, port = port, blocking = TRUE, open = "a+b",  : 
  cannot open the connection
Calls: <Anonymous> ... doTryCatch -> recvData -> makeSOCKmaster -> socketConnection
In addition: Warning message:
In socketConnection(master, port = port, blocking = TRUE, open = "a+b",  :
  soumen-HP-ProBook-440-G2:11001 cannot be opened
Execution halted

My sessionInfo() is as follwos

R version 3.2.1 (2015-06-18)
Platform: x86_64-unknown-linux-gnu (64-bit)
Running under: Ubuntu 14.04.1 LTS

 [1] LC_CTYPE=en_IN       LC_NUMERIC=C         LC_TIME=en_IN       
 [7] LC_PAPER=en_IN       LC_NAME=C            LC_ADDRESS=C        

attached base packages:
[1] parallel  stats     graphics  grDevices utils     datasets  methods  
[8] base   

I dont know how to solve this problem.Plese help me to solve this problem.


Soumen Pal

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