You have to port forward.
If you did it properly, then there's nothing else you can really do.
tried again and I got this
How can you be so sure that you port forwarded properly?
presumably because he followed instructions?
What antivirus program are you using?
How can you be so sure that you port forwarded properly? Do you have UPnP disabled?
I have it enabled with TCP
Im pretty sure blockland uses UDP