If two lines are cut by a transversal and the alternate exterior angles are congruent, the lines are parallel. Interiors on Same Side Converse. If two lines are cut by a transversal and the interior angles on the same side of the transversal are supplementary, the lines are parallel.
The open port checker is a tool you can use to check your external IP address and detect open ports on your connection. This tool is useful for finding out if your port forwarding is setup correctly or if your server applications are being blocked by a firewall.
Test specific ports. Find out which TCP and UDP ports Apple software uses, then follow these steps to find out if that port is accessible on your computer. For example, if you want to make sure iTunes sharing is accessible, test to see if port 3689 is reachable on your computer.