To correct this behavior, you need to access your router settings menu and enable UPnP from the Advanced settings menu. It makes sure if you think about it since the ports used by the game need to be forwarded automatically in order for the connection to run uninterrupted.

UPnP is Disabled – According to some affected users, this issue can also appear if Universal Plug and Play is disabled in your router settings.In this case, you can resolve the conflict by whitelisting both the game executable and the ports used during the connection with the game server. The connection is blocked by Windows Defender Firewall – If you’re using a modified executable of Blade and Soul, it’s quite common for the built-in security suite (Windows Defender Firewall) to block the connection with the game server due to a false positive.In this case, your only hope at fixing the problem without having to upgrade your ISP plan (or switch over to a different provider) is to use a ping booster to alleviate the problem. Bad latency speed – As it turns out, one of the most common causes that might be responsible for this error code is an unreliable Internet connection that makes the measured latency so bad that the connection with the game server cannot be measured.

Kb2538242 error blade and soul