Use CCleaner to clean your PC registry.
*Check if your internet is OK and see if you can open other sites.
*Reset your router (restart your internet connection) and try again.
*Reset your computer's DNS Cache ->
Code:
Click Start.
Select Programs.
Select Accessories and locate the Command Prompt shortcut.
Right click the Command Prompt shortcut and select Run as Administrator from the drop down menu.
Type ipconfig /release in the command prompt.
Wait a few seconds for a reply that the IP address has been released.
Type ipconfig /renew in the command prompt.
Wait a few seconds for a reply that the IP address has been re-established.
Type ipconfig /flushdns in the command prompt.
Close the command prompt and attempt to make a connection.
*If nothing so far worked go and call your internet provider and tell them that you cannot open exactly this address: "infinitymu.net" Internet Service Providers sometimes block sites/ip address ranges by mistake and this is the most possible reason why your "Connect" button is missing.