As it turns out - after wasting hours on trying to figure out why the web interface on the index peers didn't start anymore - I figured out that after the index peer as been successfully connected to a cluster master - it will not start the web interface for the peer (even though port 8000 is reported as open) unless the Index Master is started first.
I'm not sure at which point this changed, because the peers have been restarted successfully several times until now...
Short answer: Start any Cluster Master before starting any peer - that may solve your problem (at least in 6.4.3)
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