新安装的Android Studio 2020.3.1.25无法启动报错求助

我启动Android Studio时出现如下报错，所用版本为android-studio-2020.3.1.25。我已尝试卸载后重新安装，也删除了本地和漫游目录下的相关配置文件，在相关站点也未找到可行解决方案。

java.util.concurrent.CompletionException: java.lang.IllegalStateException: failed to create a child event loop
    at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314)
    at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319)
    at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1702)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
    at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalStateException: failed to create a child event loop
    at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:88)
    at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:58)
    at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:47)
    at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:59)
    at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:86)
    at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:81)
    at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:68)
    at org.jetbrains.io.BuiltInServerKt.multiThreadEventLoopGroup(BuiltInServer.kt:144)
    at org.jetbrains.io.BuiltInServerKt.access$multiThreadEventLoopGroup(BuiltInServer.kt:1)
    at org.jetbrains.io.BuiltInServer$Companion.start(BuiltInServer.kt:54)
    at org.jetbrains.io.BuiltInServer.start(BuiltInServer.kt)
    at com.intellij.idea.SocketLock.lambda$lockAndTryActivate$2(SocketLock.java:171)
    at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
    ... 7 more
Caused by: io.netty.channel.ChannelException: failed to open a new selector
    at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:175)
    at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:142)
    at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:146)
    at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:37)
    at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
    ... 19 more
Caused by: java.io.IOException: Unable to establish loopback connection
    at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:94)
    at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:61)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/sun.nio.ch.PipeImpl.<init>(PipeImpl.java:171)
    at java.base/sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
    at java.base/java.nio.channels.Pipe.open(Pipe.java:155)
    at java.base/sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:142)
    at java.base/sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
    at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:173)
    ... 23 more
Caused by: java.net.BindException: Cannot assign requested address: connect
    at java.base/sun.nio.ch.Net.connect0(Native Method)
    at java.base/sun.nio.ch.Net.connect(Net.java:476)
    at java.base/sun.nio.ch.Net.connect(Net.java:468)
    at java.base/sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:694)
    at java.base/java.nio.channels.SocketChannel.open(SocketChannel.java:194)
    at java.base/sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:127)
    at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:76)
    ... 31 more

-----
Your JRE: 11.0.10+0-b96-7249189 amd64 (Oracle Corporation)
C:\Program Files\Android\Android Studio\jre

故障根因 #

报错根本原因为本地环回连接建立失败，端口绑定异常，属于系统网络配置问题，和Android Studio安装包本身无关，因此重装、删除本地配置无法解决问题，可按以下步骤排查修复：

解决方案 #

• 检查本地hosts配置
  进入路径C:\Windows\System32\drivers\etc，用管理员权限打开hosts文件，确认配置行127.0.0.1 localhost未被注释或删除，如不存在则手动添加，保存后打开命令提示符执行ipconfig /flushdns刷新DNS缓存。
• 排查端口占用情况
  打开命令提示符执行netstat -ano | findstr "6942"，检查Android Studio默认通信端口是否被其他进程占用，如果存在占用记录，可通过任务管理器结束对应PID的进程，或临时关闭VPN、代理工具、游戏加速器等可能批量占用本地端口的软件后重试。
• 关闭安全拦截测试
  临时关闭Windows Defender防火墙和第三方杀毒、安全管理类软件，再尝试启动Android Studio，若可正常启动，将Android Studio安装目录下的studio64.exe、jre文件夹加入对应安全软件的白名单即可。
• 修改启动参数强制使用IPv4
  进入Android Studio安装目录下的bin文件夹，用文本编辑器打开studio64.exe.vmoptions文件，在末尾新增一行配置：-Djava.net.preferIPv4Stack=true，保存后重新启动Android Studio，规避IPv6配置异常导致的绑定失败。

内容的提问来源于stack exchange，提问作者Dhruv millu