Fix for League of Legends client/launcher not opening in Patch 4.21

by   •   League of Legends
 
This post is over 9 years old and may contain information that is incorrect, outdated, or no longer relevant.
My views and opinions can change, and those that are expressed in this post may not necessarily reflect the ones I hold today.
 

Since yesterday, I’ve been having prob­lems trying to open League of Legends. Assuming it was just a problem with Riot’s servers (because we know there’s plenty of those, such as the ones that affected my stream two days ago and I taught everyone how to Attempt to Reconnect), I just ignored it.

When I tried again today, the problem was still there, so I started digging around.

I went to my League of Legends folder to look at some logs, and found the following lines inside one of my patcher logs:

ERROR| RemotingClient: Failed to resolve host:port 'localhost:2997' to an ipv4 address.
       getaddrinfo returned: 11001
ERROR| Riot::Client::BrowserProcess::Init: Unable to connect to app process.

To fix that, I updated my hosts file to allow it to associate an IPv4 address with localhost.

To do that, navigate to:

C:\Windows\system32\drivers\etc

Open the hosts file. I recommend doing so with something like Notepad.exe, but any plain-text editor will work.

Add the following line of text to your hosts file:

127.0.0.1 localhost

If there are any other lines that contain localhost after a space, remove it (for example, if your file contains “::1 localhost,” remove that line).

That fixed the problem for me, and my launcher started working again. Unfortunately, if that doesn’t work for you, I don’t have any other suggestions, because I stopped researching once I found a solution that worked for me.

 

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