Mundobam

When i finish install the whmcs on my pc, give me this error when i try access to admin area: CONNECTION ERROR has not been able to verify your license for the last few days. Before you can access your WHMCS Admin Area again, the license needs to be validated successfully. Please check & ensure that you don't have a firewall or DNS rule blocking outgoing connections to our website. For further assistance, please visit http://docs.whmcs.com/Licensing Somebody can help me? I don't know what do