DNS Windows server 2012 R2 Configuration and Plesk

i did the configuration of dns on plesk and seems that was working ok because i can add the websites there i just need to point the domains for my dns in fact the website [login to view URL] is running there but the problema is with the domains of my country the domains .pt i try to change the dns settings [login to view URL] and say everything ok [login to view URL] but when i go there again they dont save the dns [login to view URL] so i contact the place where i bought the domains The analysis of [login to view URL] the error message is giving error in a third dns server that is: "ns344407" DnsException: Error # 15; Server name invalid names; Invalid nameserver name; ns344407. The ns344407 server is connecting to the other two servers and this is what is happening the problem. If you do not use the dns server ns344407 should remove it to prevent continue to make connection with the dns [login to view URL] this was the answer of them this is the website that they use to check to see if the configuration is right [login to view URL] [login to view URL] [login to view URL] This was the result [login to view URL]