If it does not appear when you "Querry Lan", then you're doing something wrong.
No way, that helps.
Sometimes you can't see your own server through LAN while hosting dedicated because of your windows firewall settings. It sounds odd, but I've re-created this issue just the other day and I solved it by doing the following. I hope I can help you out.
You need to make sure that what ever anti-virus or firewall you have is allowing blockland to communicate with the master server. As this may not effect your ability to see the server on lan, it's very important that you do this anyway.
You also need to make sure that if you are forwarding your ports that you don't have your ports forwarded while OPM is on. (A setting on a lot of routers that forces all gateways and ports to be open for a host) Either turn it off and specifically assign ports, or keep it on and remove the port assignments.
Also, another thing that I might suggest doing is try installing a blockland on a different home computer and try connecting. This way you can see if it's the server's issue (dedicated) or if it's a issue relating to the client it's self connecting.