Maybe you are blocking blockland's connection?Ex: You have a firewall turned on and it is blocking programs not on it's whitelist. Try adding it to the whitelist and that may help?
Are you able to play other games which connect with the internet?Do you have any non-OS-specific firewall software installed?
If you have anti-virus, it may be blocking the bits from being sent and received. Try disabling it for a few moments and try again.