I have a problem with a DDNS address not being recognised by one QNAP NAS, so it can't replicate to a second QNAP NAS.
As for using the IP address, replication works absolutely fine, but not when using the domain record.
The receiving QNAP NAS has the DDNS client set up, and successful updates every 10 minutes:
If I do a nslookup, the DNS record matches the IP address.
So, when I ...