However, withdrawal from caffeine is seldom dangerous, though it can make one uncomfortable for a few days. The most frequent symptom associated with this withdrawal is a moderate to severe headache. This can occur between 12 and 24 hours after last intake of caffeine.
Okay, for step one you need to get the command blocks in your inventory. Make sure you have cheats ON and say /give (player name) command_block. After you get in in your inventory place 5 in a row.
When trying to block access through a port, it can be helpful to review all the rules which cite the port number. To do this, use the Windows Firewall with Advanced Security MMC snap-in and sort the inbound and outbound rules by port number.