DNS RBL check timed out on dnsbl.anticaptcha.net: Yet another DNSBL blocklist is gone

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Published on July 6th 2021 - Listed in Monitoring Internet Mail


In our monitoring, using Matteo Corti's check_rbl monitoring plugin, I noticed timeouts from the dnsbl.anticaptcha.net blocklist.

RBL Timeout

Manual verification also showed a timeout:

# /usr/lib/nagios/plugins/check_rbl -H MYIP -s dnsbl.anticaptcha.net
RBL UNKNOWN - plugin timed out (timeout 15s)

Quick visit on the domain also shows why:

anticaptcha.net for sale

Time to remove the block list from the check_rbl.ini file.


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