title: Errors in makeCluster(multicore): cannot open the connection
body: <p>I have the following question.</p>
  <p>Why when submit the job on the standard node (maximum cores 56) everything runs fine, however when I submit the same job/code to the large_memory node (maximum cores 128), I get an error?</p>
  <h3>Parallelization code in R:</h3>
  <pre><code>&gt; no_cores &lt;- detectCores() - 1
  
  &gt; cl &lt;- makeCluster(no_cores, outfile=paste0('./info_parallel.log'))
  </code></pre>
  <h3>Error</h3>
  <blockquote>
  <pre><code>Error in socketConnection(master, port = port, blocking = TRUE, open = &quot;a+b&quot;,  :
    cannot open the connection
  
  Calls: &lt;Anonymous&gt; ... doTryCatch -&gt; recvData -&gt; makeSOCKmaster -&gt; 
    socketConnection
  
  In addition: Warning message:
  
  In socketConnection(master, port = port, blocking = TRUE, open = &quot;a+b&quot;,  :
    localhost:11232 cannot be opened
  Execution halted
  
  Error in unserialize(node$con) : error reading from connection
  Calls: &lt;Anonymous&gt; ... doTryCatch -&gt; recvData -&gt; recvData.SOCKnode -&gt; unserialize
  Execution halted
  
  Error in unserialize(node$con) : error reading from connection
  Calls: &lt;Anonymous&gt; ... doTryCatch -&gt; recvData -&gt; recvData.SOCKnode -&gt;  unserialize
  Execution halted
  </code></pre>
  </blockquote>
  <hr />
  <p>As I said, the R code runs fine on the standard nodes, so I assume it is a problem with the large_memory node. What can that be?</p>