Thank you. Actually, I haven't touched anything and it worked all by itself. Now xyz.com shows standard ISPconfig's index.html start page. Guess DNS had to propagate. Could it be due to DNS propagation? But this happened to me on other domains as well and now I know what to look for. All my domains are set to an IP, not * and I use nginx, not Apache. Regarding your guidance that all domain names should end with the dot: even if I don't add the dot at the end, ISPconfig adds it automatically. Follow up: Should I put IP of ISPconfig #2 in "Allow zone transfers to these IPs" on ISPconfig #1? I did but mxtoolbox.com reports "Serial numbers do not match". Is it because of that?