In the past couple of months we have seen all sorts of strange behaviours
from our ES nodes. Symptoms included:
- failed to detect master / nodes
- failed to connect to nodes
- all sorts of other zen discovery related issues, also with unicast enabled
Today we discovered that we had a couple of firewalls that we not just
managing ports, but also messing with the connections. They included things
like connection limits (fair enough for external traffic, but a killer for
internal traffic), and system protections against a wide variety of things.
After disabling these protections and connection limits on our traffic
everything seemed to jump back to normal instantly.
So make sure you check you have no hardware/software firewalls that are
doing "smart" stuff. Even if you open the ports it might be possible that
there is some kind of global "security policy".
Just to share with other people that might face the seem problems.
Chief Data Architect
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