State=unknown, down. PBSr20 on CentOS8.1

I want to use PBS on my single workstation for queueing my numerical simulations. The system is CentOS8.1. I followed the install steps of release 20_0_branch on github, but the state is “unknown, down” after pbsnodes -a during the test.
Is there any way to fix this problem?
Thank you very much.



  1. check firewall is disabled (15001 to 15009 , 17001 ports should be open), selinux is disabled and system rebooted
  2. check pbs_mom services are running on the system ( ps -ef | grep pbs_ )
  3. Check DNS ( reverse resolution) , /etc/hosts , hostname resolvable

Hope this helps

These do work.
Thank you very much.