Failed to lookup registrar and hosting information of elitetrainers.edu.gr at this time. Please contact Cloudflare Support or try again later.
Greetings,
Thank you for asking.
Regarding the “Failed to lookup registrar and hosting information” error, may I suggest you to try looking into below articles to troubleshoot the issue:
Nevertheless, I do see your domain has got DNSSEC enabled. When I do check the DNSSEC, I see there is 1 DS records added and some other issue with nameserver 
It seems to me like DNSSEC was enabled before you changed your domain nameservers to Cloudflare and one nameserver is pointed to some strange ns4.cloudflare.com unknown to me
If you recently changed your domain nameservers, have you checked if the DNSSEC was disabled and any DS records removed at your domain registrar before domain nameservers were changed?
Kindly, I’d suggest you to contact and ask your domain registrar to disable DNSSEC for your domain and remove any of the existing DS records at their interface.
Nevertheless, you might have to wait up to 48 or 72 hours for proper DNS propagation and to clear the DS/DNSSEC entries for your domain name.
Unfortunately, this is a know “issue”, or rather to say it happens. Before we change domain nameservers, we should make sure we disable the DNSSEC feature and remove any of the existing DS type of DNS records for our domain at our domainr registrar.
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