Dear all, Parallel execution of 'gamess' give the output which is given below. I guess that this is due to some internal firewall of ubuntu because I am using a separate switch with no Internet connection. could you please let me know how to overcome this problem. which command about iptables should I run on master and other nodes. As I am first time preparing the cluster so guide me about the running the cluster, from which node should I start my job, master or some other nodes. with regards yours sincerely Haider Abbas ----- GAMESS execution script 'rungms' ----- This job is running on host physics-OptiPlex-3046 under operating system Linux at Sat Oct 6 14:32:01 IST 2018 Available scratch disk space (Kbyte units) at beginning of the job is Filesystem 1K-blocks Used Available Use% Mounted on master:/home/mpiuser 953145344 23300096 881404928 3% /home/mpiuser GAMESS temporary binary files will be written to /home/mpiuser/gamess GAMESS supplementary output files will be written to /home/mpiuser/scr Copying input file siguanine.inp to your run's scratch directory... cp siguanine.inp /home/mpiuser/gamess/siguanine.F05 unset echo /home/mpiuser/gamess/ddikick.x /home/mpiuser/gamess/gamess.00.x siguanine -ddi 10 40 master:cpus=4 node1:cpus=4 node2:cpus=4 node3:cpus=4 node4:cpus=4 node5:cpus=4 node6:cpus=4 node7:cpus=4 node8:cpus=4 node9:cpus=4 -scr /home/mpiuser/gamess Distributed Data Interface kickoff program. Initiating 40 compute processes on 10 nodes to run the following command: /home/mpiuser/gamess/gamess.00.x siguanine TCP connect error: ECONNREFUSED. DDI Process 40: error code 911 TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. DDI Process 42: error code 911 TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. DDI Process 1: error code 911 TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. DDI Process 41: error code 911 TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. DDI Process 43: error code 911 TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. DDI Process 2: error code 911 TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. DDI Process 3: error code 911 TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. DDI Process 0: error code 911 TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. TCP connect error: ECONNREFUSED. TCP: Connect failed. physics-OptiPlex-3046 -> master:35850. ddikick.x: Timed out while waiting for DDI processes to check in. ddikick.x: Fatal error detected. The error is most likely to be in the application, so check for input errors, disk space, memory needs, application bugs, etc. ddikick.x will now clean up all processes, and exit... ddikick.x: Sending kill signal to DDI processes. ddikick.x: Execution terminated due to error(s). unset echo ----- accounting info ----- Files used on the master node physics-OptiPlex-3046 were: -rw-r--r-- 1 mpiuser mpiuser 2594 Oct 6 14:28 /home/mpiuser/gamess/siguanine.F05 -rw-r--r-- 1 physics physics 2594 Aug 8 2016 /home/mpiuser/gamess/siguanine.inp -rw-rw-r-- 1 mpiuser mpiuser 7856 Oct 6 14:29 /home/mpiuser/gamess/siguanine.out ls: No match. ls: No match. ls: No match. Files from node1 are: -rw-r--r-- 1 physics physics 2594 Aug 8 2016 /home/mpiuser/gamess/siguanine.inp -rw-rw-r-- 1 mpiuser mpiuser 8166 Oct 6 14:29 /home/mpiuser/gamess/siguanine.out Files from node2 are: -rw-r--r-- 1 physics physics 2594 Aug 8 2016 /home/mpiuser/gamess/siguanine.inp -rw-rw-r-- 1 mpiuser mpiuser 8352 Oct 6 14:29 /home/mpiuser/gamess/siguanine.out Files from node3 are: -rw-r--r-- 1 physics physics 2594 Aug 8 2016 /home/mpiuser/gamess/siguanine.inp -rw-rw-r-- 1 mpiuser mpiuser 8538 Oct 6 14:29 /home/mpiuser/gamess/siguanine.out Files from node4 are: _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss