The authoritative name servers for mikeswebb.com are dns31.register.com and dns32.register.com. These are the name servers where you have to create/change the DNS records for mikeswebb.com (set the A record to 18.104.22.168).
pinhole created to allow access thru the cayman firewall (i guess); settings are
extern port start 80
extern port stop 80
lan address 192.168.3.4 (computer with ispconfig)
internal port 80
believe cayman dsl router setting are complete ?
You have to forward all needed ports from your router to your ISPConfig system (e.g. 80 for http, 81 for ISPConfig, 25 for SMTP, 21 for FTP, 22 for SSH, 53 (TCP and UDP) for DNS, 110 for POP3, 143 for IMAP, 443 for https, ...).