hello,
disable it for sure on indexers, mainly because you wan't all configuration to be consistent in a indexer cluster.
For the rest :
no need on deployer
the web interface is usefull on the cluster master to monitor your cluster and do some operations.
on heavy forwarder, it depends on what app you use.
if you can push all the config via DS on HF -> you can disable web interface
if you have a app such as DBX, Checkpoint, ....it will be probably be better to let the web interface up.
btw , for the license master, you could configure it via files and monitor via Monitoring Console.
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