your ns1 and ns2 are working but ns3 is not.
if you request the website and ns3 is asked to forward you to the server then it can not fulfil that request as it is not known.
you need to fix dns first before looking further.
when ns1 and ns2 are resolving then they see 3 nameservers, but it ends there…
Nameserver records returned by the parent servers are:
ns2.netart.pl. [‘85.128.129.10’] (NO GLUE) [TTL=86400]
ns1.netart.pl. [‘85.128.128.10’] (NO GLUE) [TTL=86400]
NS records got from your nameservers listed at the parent NS are:
ns2.netart.pl [‘85.128.129.10’] [TTL=3600]
ns1.netart.pl [‘85.128.128.10’] [TTL=3600]
ns3.netart.pl [‘85.128.130.10’] [TTL=3600]
FAIL: The following nameservers are listed at your nameservers as nameservers for your domain, but are not listed at the parent nameservers (see RFC2181 5.4.1). You need to make sure that these nameservers are working.If they are not working ok, you may have problems!
ns3.netart.pl
Your SOA serial number is: 2008133202. That is NOT OK
dns squish
Asking A.NIC.eu (91.200.16.100) for kurdak.eu (type ANY)
Referral: kurdak.eu is at ns2.netart.pl - IP not supplied
Referral: kurdak.eu is at ns1.netart.pl - IP not supplied ok
Resolving ns1.netart.pl…
Results of lookup:
33.3% 85.128.128.10 (ns1.netart.pl) with 85.128.128.10
33.3% 85.128.129.10 (ns2.netart.pl) with 85.128.128.10
33.3% 85.128.130.10 (ns3.netart.pl) with 85.128.128.10
Resolving ns2.netart.pl…
Results of lookup:
33.3% 85.128.128.10 (ns1.netart.pl) with 85.128.129.10
33.3% 85.128.129.10 (ns2.netart.pl) with 85.128.129.10
33.3% 85.128.130.10 (ns3.netart.pl) with 85.128.129.10
Servers involved in resolving kurdak.eu
The following servers have been encountered and could take over the DNS entry kurdak.eu
ns1.netart.pl 85.128.128.10 Unknown
ns2.netart.pl 85.128.129.10 Unknown
ns3.netart.pl 85.128.130.10 Unknown
however, where is ns3.netart.pl?
50.0% of queries will be returned by 85.128.128.10 (ns1.netart.pl)
kurdak.eu. 3600 IN NS ns2.netart.pl.
kurdak.eu. 3600 IN NS ns3.netart.pl.
kurdak.eu. 3600 IN NS ns1.netart.pl.
kurdak.eu. 3600 IN MX 10 kurdak.eu.
kurdak.eu. 3600 IN A 89.75.106.137
kurdak.eu. 3600 IN SOA ns1.netart.pl. biuro.netart.pl. (
2008133202 ; Serial
28800 ; Refresh
7200 ; Retry
604800 ; Expire
86400 ) ; Minimum TTL
50.0% of queries will be returned by 85.128.129.10 (ns2.netart.pl)
kurdak.eu. 3600 IN MX 10 kurdak.eu.
kurdak.eu. 3600 IN A 89.75.106.137
kurdak.eu. 3600 IN NS ns2.netart.pl.
kurdak.eu. 3600 IN NS ns3.netart.pl.
kurdak.eu. 3600 IN NS ns1.netart.pl.
kurdak.eu. 3600 IN SOA ns1.netart.pl. biuro.netart.pl. (
2008133202 ; Serial
28800 ; Refresh
7200 ; Retry
604800 ; Expire
86400 ) ; Minimum TTL