Welcome to HBH! If you have tried to register and didn't get a verification email, please using the following link to resend the verification email.
Unique problem-- plenty of ports, no entry!
Indeed. It is possible to configure computers to say that all, or most, ports are open. There are also firewalls and router settings that will get this result. As a few suggestions: scan with -sT or other scan types. Use -T0 or -T1 to avoid firewall lockout. Use fragmentation to possibly bypass firewall policy all together and maybe zombie scan from something else on the network that may be more trusted.
-Grey