ah!
If I ping or do a nslookup on the domain name that's pointed to my server's IP, I get a reply from an IP that's not my server's IP address.
Think that the issue stems from an non-updated DNS server.
I have a local cache DNS server. The first time that I nslookup a name it cannot handle and gets the record from another authoritative DNS near to me. From that time on the backup server continues to give the first record.
Investigating in this direction should bring you to find "who" still caches the old IP.
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