On Linux, I prevented remote access to this port using iptables:
# /sbin/iptables -A INPUT -s 127.0.0.1/32 -p tcp -m tcp --dport 8191 -j ACCEPT
# /sbin/iptables -A INPUT -p tcp -m tcp --dport 8191 -j DROP
# /sbin/service iptables save
The first line allows local access to the port, the second line denies all other access.
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Forwarders are supposed to hold data while the indexer restarts and resume sending once the indexer is available again. How long was the indexer down? How much data is the forwarder trying to send during the outage? Are there any error messages in the forwarder's splunkd.log file?
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