DNSBL/SURBL Server::check 242.12.136.213.sbl-xbl.spamhaus.org error=2: 'Host name lookup f

We are seeying this in the FortiMail Anti-SPam log:

DNSBL/SURBL Server::check 242.12.136.213.sbl-xbl.spamhaus.org error=2: 'Host name lookup failure'

DNSBL/SURBL Server::check 30.100.67.158.bl.spamcop.net error=2: 'Host name lookup failure'

Anyone got any idea if this is normal / how-to fix if it isnt?

DNS is working because:

execute nslookup name spamhous.org

Non-authoritative answer:
Name: spamhous.org
Address: 208.73.210.212
Name: spamhous.org
Address: 208.73.211.194
Name: spamhous.org
Address: 208.73.211.199
Name: spamhous.org
Address: 208.73.211.191