Messenger service. This feature allows the display of a message to a blocked
connecting IP address to inform the user that they are blocked in the
firewall. This can help when users get themselves blocked, e.g. due to
multiple login failures. The service is provided by two daemons running on
ports providing either an HTML or TEXT message.
This feature does not work on servers that do not have the iptables module
ipt_REDIRECT loaded. Typically, this will be with MONOLITHIC kernels. VPS
server admins should check with their VPS host provider that the iptables
module is included.
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