title: mpiexec unable to connect to msmpi service in windows 7
body: <p>when ever I tried  this command </p>
  
  <pre><code>mpiexec -hosts 2 192.168.22.23 1 192.168.22.24 1 c:\sarah\mpiparallel.exe
  </code></pre>
  
  <p>I get these errors:</p>
  
  <pre><code> _ mpiexec running on SARA-PC is unable to connect to msmpi service on 192.168.22.2
      3:8677
  
      Other MPI error, error stack:
      MPIDU_Sock_post_connect_filter(1278): unable to connect to 192.168.22.23 on port
       8677, exhausted all endpoints
      MPIDU_Sock_post_connect_filter(1328): unable to connect to 192.168.22.23 on port
       8677, No connection could be made because the target machine actively refused i
      t.  (errno 10061)_
  </code></pre>
  
  <p>I really search alot about these errors but I couldn't find any useful thing!</p>