If you are prompted for an administrator password or confirmation, type the password for confirmation.In the left pane click ' Advanced Settings'.Click on the ' Windows Firewall' option that appears.Windows 8: Hit Windows key + X and then click on the ‘ Control Panel’ to open it.
Windows 7: Open up your desktop Start menu then click on the ' Control Panel' option to open it. PLEASE NOTE: The steps below affect Windows connections only. You can check if all the required ports are blocked or not with any free online service, e.g. In order to play a dev-version you also have to open the following ports: The router forwards correctly addressed packets to the sender service using the IP and port number.The following ports required to be opened for the game: The packet filter and firewall also ensure that packets that cannot be assigned to a local application are rejected. The public router IP, which also appears as the sender of data packets, is thus externally visible and addressable. Since unwanted network connections between local computers and the Internet are to be avoided as much as possible, the router IP usually comes between local IPs and destination addresses. The target application learns the sender port when the connection is established and sends the desired data packets back to the sender address. Open ports of target addresses “listen” for requests that originate via a port from private or public IPs. The destination address can be an app, a service, a website, or any other program such as a web browser.
Transport protocols such as UDP (User Datagram Protocol) and TCP (Transmission Control Protocol) transfer data packets by assigning them to a specific address consisting of an IP and port number.
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