Graylog-3.0.0-alpha.5 nodes unavailable

CentOS Linux release 7.6.1810 (Core)

CentOS installation

Refer to the above link for deployment, and the installation process is all normal.
When Graylog is started, the service is fine.
However, system-nodes is “normal” for a while and "System information is currently unavailable "for a while.
Check log information as follows:

that single message does not help to identify possible issues. It could ne nearly everything. Started from a misconfiguration of Graylog, iptables or a full disk.

if you run alpha builds, you should be able to identify what is the issue by investigating and if you found a bug by reporting the issue at Github.

Thank you

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