Can't change nameservers

Hello
I use eu.org subdomain and when I try change the nameservers then I get this message:

> ---- Servers and domain names check
> 
> Getting IP for CLAY.NS.Cloudflare.COM: 173.245.59.88
> Getting IP for CLAY.NS.Cloudflare.COM: 2400:cb00:2049:1::adf5:3b58
> Getting IP for MEGAN.NS.Cloudflare.COM: 173.245.58.197
> Getting IP for MEGAN.NS.Cloudflare.COM: 2400:cb00:2049:1::adf5:3ac5
> 
> ---- Checking SOA records for idunetwork.eu.org
> 
> SOA from CLAY.NS.Cloudflare.COM at 173.245.59.88: serial 2025286745 (7.415 ms)
> SOA from CLAY.NS.Cloudflare.COM at 2400:cb00:2049:1::adf5:3b58: Error: Timeout (20007.854 ms)
> SOA from MEGAN.NS.Cloudflare.COM at 173.245.58.197: serial 2025286745 (5.709 ms)
> SOA from MEGAN.NS.Cloudflare.COM at 2400:cb00:2049:1::adf5:3ac5: Error: Timeout (20001.320 ms)
> 
> ---- Checking NS records for idunetwork.eu.org
> 
> NS from CLAY.NS.Cloudflare.COM at 173.245.59.88: ok (6.465 ms)
> NS from CLAY.NS.Cloudflare.COM at 2400:cb00:2049:1::adf5:3b58: Error: Timeout (20008.320 ms)
> NS from MEGAN.NS.Cloudflare.COM at 173.245.58.197: ok (6.704 ms)
> NS from MEGAN.NS.Cloudflare.COM at 2400:cb00:2049:1::adf5:3ac5: Error: Timeout (20005.341 ms)
> 
> 
> 4 errors(s)

What is the problem?
I can see that eu.org can’t connect or something like that to Cloudflare ipv6 address. If I register an another subdomain and get other nameservers from Cloudflare then I can change nameservers.

If resubmitting the change doesn’t work, I would recommend contacting their support. All Cloudflare nameservers have both IPv6 and v6 addresses as far as I am aware, so I don’t believe changing doa different pair would change the IPv6 lookup.

dig idunetwork.eu.org soa @2400:cb00:2049:1::adf5:3ac5 +short
clay.ns.Cloudflare.com. dns.Cloudflare.com. 2025286745 10000 2400 604800 3600

Doing the same lookup from my machine that I imagine they are attempting works. So if it wasn’t a transient error it might be a problem with the validation script they use.

If I change to cloudns then it works:

---- Servers and domain names check

Getting IP for NS11.CLOUDNS.NET: 109.201.133.194
Getting IP for NS11.CLOUDNS.NET: 2a00:1768:1001:9::11
Getting IP for NS12.CLOUDNS.NET: 108.59.6.24
Getting IP for NS12.CLOUDNS.NET: 2604:9a00:2100:a008:7::1
Getting IP for NS13.CLOUDNS.NET: 188.241.115.14
Getting IP for NS14.CLOUDNS.NET: 88.198.111.107
Getting IP for NS14.CLOUDNS.NET: 2a01:4f8:160:6082::14

---- Checking SOA records for idunetwork.eu.org

SOA from NS11.CLOUDNS.NET at 109.201.133.194: serial 2017050606 (21.126 ms)
SOA from NS11.CLOUDNS.NET at 2a00:1768:1001:9::11: serial 2017050606 (19.262 ms)
SOA from NS12.CLOUDNS.NET at 108.59.6.24: serial 2017050606 (88.454 ms)
SOA from NS12.CLOUDNS.NET at 2604:9a00:2100:a008:7::1: serial 2017050606 (98.446 ms)
SOA from NS13.CLOUDNS.NET at 188.241.115.14: serial 2017050606 (43.043 ms)
SOA from NS14.CLOUDNS.NET at 88.198.111.107: serial 2017050606 (21.793 ms)
SOA from NS14.CLOUDNS.NET at 2a01:4f8:160:6082::14: serial 2017050606 (22.844 ms)

---- Checking NS records for idunetwork.eu.org

NS from NS11.CLOUDNS.NET at 109.201.133.194: ok (29.772 ms)
NS from NS11.CLOUDNS.NET at 2a00:1768:1001:9::11: ok (19.118 ms)
NS from NS12.CLOUDNS.NET at 108.59.6.24: ok (91.210 ms)
NS from NS12.CLOUDNS.NET at 2604:9a00:2100:a008:7::1: ok (97.767 ms)
NS from NS13.CLOUDNS.NET at 188.241.115.14: ok (42.944 ms)
NS from NS14.CLOUDNS.NET at 88.198.111.107: ok (20.499 ms)
NS from NS14.CLOUDNS.NET at 2a01:4f8:160:6082::14: ok (22.888 ms)


No error, applying changes...

Done

Hmm I don’t know.

hmm… (feeling like an idiot now). If you retry with the CF servers do you get the same error?

Yeah, I get the same error (only timeout ms is different):

---- Servers and domain names check

Getting IP for CLAY.NS.Cloudflare.COM: 173.245.59.88
Getting IP for CLAY.NS.Cloudflare.COM: 2400:cb00:2049:1::adf5:3b58
Getting IP for MEGAN.NS.Cloudflare.COM: 173.245.58.197
Getting IP for MEGAN.NS.Cloudflare.COM: 2400:cb00:2049:1::adf5:3ac5

---- Checking SOA records for idunetwork.eu.org

SOA from CLAY.NS.Cloudflare.COM at 173.245.59.88: serial 2025286745 (12.329 ms)
SOA from CLAY.NS.Cloudflare.COM at 2400:cb00:2049:1::adf5:3b58: Error: Timeout (20005.625 ms)
SOA from MEGAN.NS.Cloudflare.COM at 173.245.58.197: serial 2025286745 (5.879 ms)
SOA from MEGAN.NS.Cloudflare.COM at 2400:cb00:2049:1::adf5:3ac5: Error: Timeout (20002.642 ms)

---- Checking NS records for idunetwork.eu.org

NS from CLAY.NS.Cloudflare.COM at 173.245.59.88: ok (6.648 ms)
NS from CLAY.NS.Cloudflare.COM at 2400:cb00:2049:1::adf5:3b58: Error: Timeout (20002.685 ms)
NS from MEGAN.NS.Cloudflare.COM at 173.245.58.197: ok (6.665 ms)
NS from MEGAN.NS.Cloudflare.COM at 2400:cb00:2049:1::adf5:3ac5: Error: Timeout (20002.745 ms)


4 errors(s)