After Upgrade to 4.3.7: No leader Graylog server node

After the Upgrade from 4.3.3 to 4.3.7 I get periodic error messages that I have no leader Graylog server node in my cluster.

In the Graylog Node view (https:///system/nodes) I can see that my master node is there, than disappears, than appears again … and so on.

Version 4.3.3 was running perfectly fine.

Please help.

What is written in the log?
And just for sure: Did you notice the change in configuration " Configuration File Changes"? →

You can post you config file if you like:

  • Use the </> forum tool to make the code readable
  • Obfuscate where needed
  • take out the comments with:
    ** cat /etc/graylog/server/server.conf | egrep -v "^\s*(#|$)"