I can’t, because the SFTP connectivity validation fails.
Via ssh on the NS I have tested:
sftp -4 myuser@domain.com → it works, I can connect
sftp -6 myuser@domain.com → don’t work, it don’t ask me the password, connection timed out
And if I don’t force IPv4:
sftp myuser@domain.com → it take about 2 minutes before to ask me the password and then I can connect
So i think by default it’s IPv6, no?
Did you try to verify how is the resolution of host “hostname.domain.com” from your NethServer installation?
Consider also to verify the traceroute from your NethServer to the NAS. Maybe CentOS 7 and NAS are both IPv6 capable and they are using that IP protocol version for “talking”.
yes there is, and you find it. But currently IDK if you can pass the parameter you need to SFTP. Unless somehow IPv6 answers cannot reach NS.
AFAIK nslookup is considered deprecated since decades on linux, preferring dig. nslookup moreover is still available on Windows (7, 8/8.1, 10 and 11) so… i get it wrong…
Anyway, maybe is the same from your Mint client PC and from Nethserver, but via ssh on NS you can be sure to have the proper result by NethServer perspective.