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Resolved Plesk's DNSBL server recommendation seems to be unpingable, so non-existent

J

jmar83

Regular Pleskian
Server operating system version
Plesk 18.x, most current updates
Plesk version and microupdate number
Debian 10.x, most current updates
Hello

Cite from : <Trennen Sie mehrere Einträge durch Semikola (Strichpunkte), zum Beispiel: 'zen.spamhaus.org;dnsbl.example.net'>

So i saw, the host zen.spamhaus.org ist NOT pingable (the other sone, dnsbl.example.com ist just an example, that ok)

Why?

(Same with DNSBL server from "nixspam", and also with most other DNSBL servers i found in the internet... that's really really strange i.m.o..!?)

1709338164818.png
 
Hmm.. and also a bug here in forum so it seems, ;-) - no returns before posting and also not when i try to edit my post: 1709338349941.png
 
Why should the host be pingable? Maybe they try to reduce traffic or block some attacks so that the service was not enabled? Why not ask Spamhaus about it why they disabled ping on their servers?
 
Thank you for your feedback.

My question was also because zen.spamhause.org ist a recommendation in plesk mail server config - so i was thinking that host is not available anymore so it maybe should be removed from plesk as a recommendation...

but i still don't understand how plesk mail server can reach that host via hostname if there is not domain name resolution - doesnt make sense i.m.o...
 
Ping is not a reliable method to check whether or not a remote service is available. If you want to know if zen.spamhause.org is working, make a DNS query to it in a way it is intended to work. For example running: dig +short 2.0.0.127.zen.spamhaus.org from your server.
 
jmar83 said:
but i still don't understand how plesk mail server can reach that host via hostname if there is not domain name resolution - doesnt make sense i.m.o...
Click to expand...
The name resolves, but the host does not offer the "ping" service. Ping can easily be disabled in a kernel setting, or icmp request can be blocked like iptables -A INPUT -p icmp --icmp-type echo-request -j DROP in iptables. Think of ping like a type of Internet request (just like www, but its not webservice, its ping service ...)
 
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