hello godfailed, you can read about ports here: https://forum.4game.com/showthread.php?t=3087. also make sure you added l2 and frost files to exclusions of your antivirus/firewall. how to do it you can find here https://forum.4game.com/showthread.php?t=6471 and here https://forum.4game.com/showthread.php?t=2129. this thread will be moved to technical issues. sincerely, nemezida
you can see actual solutions and issues' statuses here. additional instructions could be found here. here you can download client-check application. if you can't find a solution for your issue you always can ask for moving the thread back into the main branch. best regards