Hi Geert Jan, > Please have a look at: > https://www.ncsc.nl/dienstverlening/response-op-dreigingen-en-incidenten/beveiligingsadviezen/NCSC-2013-0597+1.00+Rate+limiting+van+DNS+responses+veroorzaakt+kwetsbaarheid.htm It gives a HTTP 404 response. Did they withdraw the message? Met vriendelijke groet, Sander Steffann