# Connection refused errno 111 **URL:** \ **Category:** Users/Site Administrators\ **Created:** [January 25, 2021, 2:43pm UTC](https://community.openpbs.org/t/connection-refused-errno-111/2444 "2021-01-25T14:43:25Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![songyi719](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@songyi719](https://community.openpbs.org/u/songyi719)\ **Post date:** [January 25, 2021, 2:43pm UTC](https://community.openpbs.org/t/connection-refused-errno-111/2444/1 "2021-01-25T14:43:25Z")
I just installed openpbs and typed qsub data.sh but it returned Connection refused qsub: cannot connect to server songyi719-Thinkpad-X1-Extreme-2nd (errno=111) server and client is same computer, and firewall is off. When I typed sudo /etc/init.d/pbs status, it returned pbs\_server is not running pbs\_mom is not running ps\_sched is pid 955875 pbs\_comm is not running I typed sudo /etc/init.d/pbs start, and it returned Starting PBS /opt/pbs/sbin/pbs\_comm ready (pid=969486), Proxy Name:songyi719-thinkpad-x1-extreme-2nd:17001, Threads:4 PBS comm PBS mom PBS scheduler already running. pgrep: cannot allocate 4611686018427387903 bytes Connecting to PBS dataservice…connected to PBS dataservice@songyi719-ThinkPad-X1-Extreme-2nd Licenses valid for 1000000 Floating hosts PBS server and I retyped status, and it showed me same result, and same error occured at qsub. What can be problem? I’ve changed PBS\_START\_MOM to 1 at pbs.conf too. Could network setting cause issue even though server and client is same pc? ---
**Author:** ![adarsh](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adarsh](https://community.openpbs.org/u/adarsh)\ **Post date:** [January 25, 2021, 2:55pm UTC](https://community.openpbs.org/t/connection-refused-errno-111/2444/2 "2021-01-25T14:55:29Z")
**Please check these:** 0. please check pbs\_server daemon is up and running ( ps -ef | grep pbs\_ ) 1. firewall is turned off 2. SELinux is disabled and system is rebooted (if you disable it now) 3. Ports 15001 to 15007 and 17001 is opened between the headnode and compute nodes (vice versa, even if the all the modules are running on one house) 4. hostname of the pbs server and compute nodes is resolvable via /etc/hosts, DNS (forward and reverse address resolution) **Please share:** /etc/pbs.conf /etc/hosts output of 1. hostname and hostname -A commands 2. /etc/init.d/pbs status or ps -ef | grep pbs\_ ---
**Author:** ![songyi719](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@songyi719](https://community.openpbs.org/u/songyi719)\ **Post date:** [January 26, 2021, 4:34am UTC](https://community.openpbs.org/t/connection-refused-errno-111/2444/3 "2021-01-26T04:34:24Z")
/etc/pbs.conf is PBS\_SERVER=songyi719-ThinkPad-X1-Extreme-2nd PBS\_START\_SERVER=1 PBS\_START\_SCHED=1 PBS\_START\_COMM=1 PBS\_START\_MOM=1 PBS\_EXEC=/opt/pbs PBS\_HOME=/var/spool/pbs PBS\_CORE\_LIMIT=unlimited PBS\_SCP=/usr/bin/scp /etc/hosts is 127.0.0.1 localhost 127.0.1.1 songyi719-ThinkPad-X1-Extreme-2nd _# The following lines are desirable for IPv6 capable hosts_ ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters output of hostname is songyi719-ThinkPad-X1-Extreme-2nd output of hostname -A is also songyi719-ThinkPad-X1-Extreme-2nd ps -ef | grep pbs\_ output is songyi7+ 13763 6459 0 13:31 pts/0 00:00:00 grep --color=auto pbs\_output firewall is turned off, SELinux is not installed since my system is ubuntu 20.04. I opened all following port. After I typed sudo /etc/init.d/pbs start, it returned Starting PBS /opt/pbs/sbin/pbs\_comm ready (pid=13950), Proxy Name:songyi719-thinkpad-x1-extreme-2nd:17001, Threads:4 PBS comm PBS mom PBS scheduler already running. pgrep: cannot allocate 4611686018427387903 bytes Connecting to PBS dataservice…connected to PBS dataservice@songyi719-ThinkPad-X1-Extreme-2nd Licenses valid for 1000000 Floating hosts PBS server And I typed /etc/inti.d/pbs status, and it returned pbs\_server is not running pbs\_mom is not running pbs\_sched is pid 1616 pbs\_comm is not running but it showed same error ---
**Author:** ![songyi719](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@songyi719](https://community.openpbs.org/u/songyi719)\ **Post date:** [January 26, 2021, 6:43am UTC](https://community.openpbs.org/t/connection-refused-errno-111/2444/4 "2021-01-26T06:43:09Z")
I solved the problem. I edited IP address at /etc/hosts to my current IP instead of LoopBack Ip and it is solved… Thanks for help