# Warewulf cluster connection to OpenPBS failure

**URL:** <https://community.openpbs.org/t/warewulf-cluster-connection-to-openpbs-failure/4223>\
**Category:** Users/Site Administrators\
**Created:** [March 18, 2026, 1:27pm UTC](https://community.openpbs.org/t/warewulf-cluster-connection-to-openpbs-failure/4223 "2026-03-18T13:27:30Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![adarsh](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adarsh](https://community.openpbs.org/u/adarsh)\
**Post date:** [March 19, 2026, 6:00pm UTC](https://community.openpbs.org/t/warewulf-cluster-connection-to-openpbs-failure/4223/2 "2026-03-19T18:00:42Z")

</div>

To understand the above correctly

- The compute nodes are booted up (PXE boot)
- pbs\_mom service is running / if this service is not up and running, you manually start the service  
[or you can make sure pbs\_mom services is started at the last once all the system servces or all up and running]
- pbsnodes -av # shows all nodes are connected to the PBS Server
- now job is submitted [whether this job runs fine or does this job fails]

> [@gpaszek\_ec-e](#):
>
> I cannot send any job to it because of an error showed in attachments.

Could you please share the job script or did you try running simple test job like below

```auto
qsub -- /bin/hostname
qsub -- /bin/sleep 10

```

Make sure on the compute nodes /var does not have any permissions set that is affecting this.  
In the above screenshot system copy ( cp or scp based on the configuration) failed, as the file did not exist.

Please check the ports are not blocked [PBS Implementation on AWS - #4 by adarsh](https://community.openpbs.org/t/pbs-implementation-on-aws/4183/4)

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