In our monitoring, using Matteo Corti's check_rbl monitoring plugin, I noticed timeouts from the dnsbl.anticaptcha.net blocklist.
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:
Time to remove the block list from the check_rbl.ini file.
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