I've installed Plesk on a VPS, added a new domain, and changed the custom name servers and personal dns name servers for my domain on namecheap.com.
Using mxtoolbox.com's dns lookup I get the error:
Loop detected! We were referred back to 'XXX.XX.XXX.XXX'
Using mxtoolbox.com's whois lookup I get:
Name Server NS1.XXXXXXX.COM
Name Server NS2.XXXXXXX.COM
Using mxtoolbox.com's dns lookup I get the error:
Loop detected! We were referred back to 'XXX.XX.XXX.XXX'
Using mxtoolbox.com's whois lookup I get:
Name Server NS1.XXXXXXX.COM
Name Server NS2.XXXXXXX.COM