From Splunk Wiki
Obviously, this is just a stub.
When troubleshooting odd deployment server behavior, it's really helpful to capture all the information the deployment server is working with, which can be done with a log.cfg category.
For example, in $SPLUNK_HOME/etc/log-local.cfg:
[splunkd] category.DeploymentServer = DEBUG
It is also useful to set the appropriate category for the deployment clients which are misbehaving:
[splunkd] category.DeploymentClient = DEBUG