Are you new to the game? What OS?
Problem most likely in permissions.
Last update was weeks ago. You played game few days ago. Let's think logically... if it's not your fault (you didn't changed settings, or installed any soft which can somehow block connection), then problem can be with your ISP. I don't see reports form any other players about this problem. If you don't believe me, then join discord and ask other players. Or if you have any friends, then ask one of them to install SW and test if game works.
What I meant was not to mean that you created the problem, and I believe you, of course, I only faced such problems while entering the game as usual, I just asked what caused it and how to solve it. (I could not tamper with the settings of the game in any way, I did not mess with the files, I did not install anything extra)
Not with settings of the game, but OS settings. Sometimes AV can cause different problems. Try to disable, if you use any. And if you don't use, then install Free BitDefender/Malwarebytes and scan your system.
If you have friend with laptop, or maybe you have laptop, then test game from different internet connections.
Can you access https://skillwarz.com ?