title: Emulator: emulator: ERROR: AdbHostServer.cpp:102: Unable to connect to adb daemon on port: 5037
body: <p>I am stuck a whole afternoon trying to run again my small Android/Kotlin application in Android Studio. The message pasted on this question topic suddenly nocked me down.</p>
  
  <p>I have done these tentatives:</p>
  
  <p>1 - cold boot (On Virtual Devices screen > Actions > Cold Boot Now)</p>
  
  <p>2 - I deleted my previous Virtual Device and I downloaded a new one (Nexus One)</p>
  
  <p>3 - I followed all steps from <a href="https://stackoverflow.com/a/49345049/4148175">other stackoverflow answer</a></p>
  
  <p>3.1</p>
  
  <pre><code>cd C:\Users\Jimis\AppData\Local\Android\Sdk\platform-tool
  
  adb kill-server
  adb.exe start-server
  adb devices -l 
  </code></pre>
  
  <p>3.2 </p>
  
  <p>deleted plataform-tool and redownlowaded it from <a href="https://developer.android.com/studio/releases/platform-tools.html#tos-header" rel="noreferrer">SDK Plataform</a></p>
  
  <p>3.3</p>
  
  <p>restart computer</p>
  
  <p>I am completely stuck.</p>
  
  <p>Something called my attention: why so many PIDs to port 5037. See bellow that initially when I started Androdi Studio I had only 3 and after I tried debug my application I got a lot more.</p>
  
  <pre><code>Microsoft Windows [versão 10.0.18363.836]
  (c) 2019 Microsoft Corporation. Todos os direitos reservados.
  
  C:\Users\Jimis&gt;netstat -ano -p tcp |find "5037"
    TCP    127.0.0.1:5037         0.0.0.0:0              LISTENING       11492
    TCP    127.0.0.1:5037         127.0.0.1:50582        ESTABLISHED     11492
    TCP    127.0.0.1:50582        127.0.0.1:5037         ESTABLISHED     10052
  
  C:\Users\Jimis&gt;netstat -ano -p tcp |find "5037"
    TCP    127.0.0.1:5037         0.0.0.0:0              LISTENING       11492
    TCP    127.0.0.1:5037         127.0.0.1:50582        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50714        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50731        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50734        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50736        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50737        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50738        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50739        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50740        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50741        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50742        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50743        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50744        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50745        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50746        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50747        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50748        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50749        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50750        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50751        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50752        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50753        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50754        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50755        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50756        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50757        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50758        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50759        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50760        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50761        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50762        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50763        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50764        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50765        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50766        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50767        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50768        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50769        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50770        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50771        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50772        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50773        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50779        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50780        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50781        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50782        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50783        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50784        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50785        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50786        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50787        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50788        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50789        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50790        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50791        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50792        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:50793        ESTABLISHED     11492
    TCP    127.0.0.1:5037         127.0.0.1:50794        ESTABLISHED     11492
    TCP    127.0.0.1:50582        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50714        127.0.0.1:5037         ESTABLISHED     792
    TCP    127.0.0.1:50717        127.0.0.1:5037         TIME_WAIT       0
    TCP    127.0.0.1:50719        127.0.0.1:5037         TIME_WAIT       0
    TCP    127.0.0.1:50722        127.0.0.1:5037         TIME_WAIT       0
    TCP    127.0.0.1:50729        127.0.0.1:5037         TIME_WAIT       0
    TCP    127.0.0.1:50731        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50734        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50736        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50738        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50739        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50740        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50741        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50742        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50743        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50744        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50745        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50746        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50747        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50748        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50749        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50750        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50751        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50752        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50753        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50754        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50755        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50756        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50757        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50758        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50760        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50761        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50762        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50763        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50764        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50765        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50766        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50767        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50768        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50770        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50771        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50772        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50773        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50791        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50793        127.0.0.1:5037         ESTABLISHED     10052
    TCP    127.0.0.1:50794        127.0.0.1:5037         ESTABLISHED     10052
  
  C:\Users\Jimis&gt;
  </code></pre>
  
  <p>Trying to figure out with "netstat -a -b" why so many established connections to same port 5037 I reached this list but I don't if it is normal when using Android Studio and Emulator</p>
  
  <pre><code>...
       TCP    127.0.0.1:5037         SPANOT149:0            LISTENING
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50582        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50714        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50731        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50734        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50736        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50738        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50739        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50740        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50741        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50742        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50744        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50745        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50746        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50747        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50748        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50750        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50751        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50753        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50756        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50757        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50760        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50761        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50762        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50763        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50764        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50765        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50766        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50767        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50768        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50770        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50772        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50773        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50793        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50797        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:50955        ESTABLISHED
       [adb.exe]
        TCP    127.0.0.1:5037         orionhost:51276        ESTABLISHED
       [adb.exe]
  </code></pre>
  
  <p>My app build.gradle</p>
  
  <pre><code>apply plugin: 'com.android.application'
  apply plugin: 'kotlin-android'
  apply plugin: 'kotlin-android-extensions'
  apply plugin: 'com.google.gms.google-services'
  
  android {
      compileSdkVersion 29
      buildToolsVersion "29.0.3"
  
      android {
          compileOptions {
              sourceCompatibility JavaVersion.VERSION_1_8
              targetCompatibility JavaVersion.VERSION_1_8
          }
      }
  
      defaultConfig {
          applicationId "com.mycomp.appfirestore"
          minSdkVersion 16
          targetSdkVersion 29
          versionCode 1
          versionName "1.0"
  
          testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
      }
  
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
          }
      }
  
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.72"
      implementation 'androidx.appcompat:appcompat:1.1.0'
      implementation 'androidx.core:core-ktx:1.2.0'
      implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
      testImplementation 'junit:junit:4.13'
      androidTestImplementation 'androidx.test.ext:junit:1.1.1'
      androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
  
      // Firebase Libraries
      implementation 'com.google.firebase:firebase-core:17.4.2'
      implementation 'com.google.firebase:firebase-auth:19.3.1'
      implementation 'com.google.firebase:firebase-database:19.3.0'
      implementation 'com.google.firebase:firebase-storage:19.1.1'
  
      implementation 'com.squareup.retrofit2:retrofit:2.9.0'
      implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
      implementation 'com.squareup.okhttp3:logging-interceptor:4.7.2'
  }
  </code></pre>
  
  <p>Project build.gradle</p>
  
  <pre><code>// Top-level build file where you can add configuration options common to all sub-projects/modules.
  
  buildscript {
      ext.kotlin_version = '1.3.71'
      repositories {
          google()
          jcenter()
  
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.6.3'
          classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
          classpath 'com.google.gms:google-services:4.3.3'
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          google()
          jcenter()
  
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p>*** added</p>
  
  <p>in case it is relevant I just aupdated to Android Studio 4.0 and same issue.</p>
  
  <pre><code>Android Studio 4.0
  Build #AI-193.6911.18.40.6514223, built on May 20, 2020
  Runtime version: 1.8.0_242-release-1644-b01 amd64
  VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
  Windows 10 10.0
  GC: ParNew, ConcurrentMarkSweep
  Memory: 1237M
  Cores: 8
  Registry: ide.new.welcome.screen.force=true
  Non-Bundled Plugins: 
  </code></pre>
  
  <p>Reading a lot on stackoverflow I reached this <a href="https://stackoverflow.com/questions/58152237/android-studio-emulator-vk-version-1-1-check-failed">other issue</a></p>
  
  <p>I tried added advancedFeatures.ini in my C:\Users....android with </p>
  
  <pre><code>Vulkan = off
  GLDirectMem = on
  </code></pre>
  
  <p>I don't know exactly what I did but I tried it anyway and I am still getting same issue. In this same stackoverflow discussion I noted someone talking about hyper-V. </p>
  
  <p>In case it is relevant, I have turned off Hyper-V some time ago in my Windows 10 because I had to use VirtualBox for other reasons (OpenShift/minishift). I don't think it has relathionship with my issue because until 2 days ago I had not such problem with port 5037. BTW, I am curious: does Androids Emulators depend on HyperV somehow?</p>
  
  <p>*** edited after Jacob's comment</p>
  
  <p>Microsoft Windows [versão 10.0.18363.836]
  (c) 2019 Microsoft Corporation. Todos os direitos reservados.</p>
  
  <p>1) Before I started Android Studio I had no connection to 5037 as expected</p>
  
  <p>C:\Users>netstat -ano | findstr "5037"</p>
  
  <p>2) Then I started Android Studio and I see at least three connections to port 5037. </p>
  
  <pre><code>C:\Users\Cast&gt;netstat -ano | findstr "5037"
    TCP    127.0.0.1:5037         0.0.0.0:0              LISTENING       11880
    TCP    127.0.0.1:5037         127.0.0.1:54602        ESTABLISHED     11880
    TCP    127.0.0.1:54602        127.0.0.1:5037         ESTABLISHED     348
  </code></pre>
  
  <p>3) And when I click on Debug app (shift + F9) I get two messages errors on left bottom side of Android Studio </p>
  
  <pre><code>Emulator: emulator: ERROR: AdbHostServer.cpp:102: Unable to connect to adb daemon on port: 5037
  
  Emulator: socketTcpLoopbackClientFor: error: fd 56668 above FD_SETSIZE (32768)
  </code></pre>
  
  <p>and a lot of connections with numerous TIME WAIT. It seems so weird to me.</p>
  
  <pre><code>C:\Users&gt;netstat -ano | findstr "5037"
    TCP    127.0.0.1:5037         0.0.0.0:0              LISTENING       11880
    TCP    127.0.0.1:5037         127.0.0.1:54602        ESTABLISHED     11880
    TCP    127.0.0.1:5037         127.0.0.1:54631        ESTABLISHED     11880
    TCP    127.0.0.1:5037         127.0.0.1:54643        ESTABLISHED     11880
    TCP    127.0.0.1:5037         127.0.0.1:54647        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54648        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54649        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54650        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54662        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54663        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54665        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54666        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54667        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54668        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54669        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54670        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54671        ESTABLISHED     11880
    TCP    127.0.0.1:5037         127.0.0.1:54672        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54673        ESTABLISHED     11880
    TCP    127.0.0.1:5037         127.0.0.1:54674        TIME_WAIT       0
    TCP    127.0.0.1:54602        127.0.0.1:5037         ESTABLISHED     348
    TCP    127.0.0.1:54631        127.0.0.1:5037         ESTABLISHED     5224
    TCP    127.0.0.1:54634        127.0.0.1:5037         TIME_WAIT       0
    TCP    127.0.0.1:54636        127.0.0.1:5037         TIME_WAIT       0
    TCP    127.0.0.1:54639        127.0.0.1:5037         TIME_WAIT       0
    TCP    127.0.0.1:54641        127.0.0.1:5037         TIME_WAIT       0
    TCP    127.0.0.1:54643        127.0.0.1:5037         ESTABLISHED     348
    TCP    127.0.0.1:54671        127.0.0.1:5037         ESTABLISHED     348
    TCP    127.0.0.1:54673        127.0.0.1:5037         ESTABLISHED     348
  
  C:\Users&gt;
  </code></pre>
  
  <p>Whole Event Log</p>
  
  <pre><code>01/06/2020
  00:08   Gradle sync started
  00:08   * daemon not running; starting now at tcp:5037
  00:08   * daemon started successfully
  00:08   Gradle sync finished in 2 s 418 ms (from cached state)
  00:08   Executing tasks: [:app:assembleDebug] in project C:\WSs\FireStoreDemos\AppFirestore
  00:08   Emulator: socketTcpLoopbackClientFor: error: fd 56296 above FD_SETSIZE (32768)
  00:08   Emulator: socketTcpLoopbackClientFor: error: fd 56296 above FD_SETSIZE (32768)
  00:08   Emulator: emulator: ERROR: AdbHostServer.cpp:102: Unable to connect to adb daemon on port: 5037
  00:08   Emulator: socketTcpLoopbackClientFor: error: fd 56668 above FD_SETSIZE (32768)
  00:08   Emulator: socketTcpLoopbackClientFor: error: fd 56668 above FD_SETSIZE (32768)
  00:08   Emulator: socketTcpLoopbackClientFor: error: fd 56928 above FD_SETSIZE (32768)
  00:08   Emulator: socketTcpLoopbackClientFor: error: fd 56928 above FD_SETSIZE (32768)
  00:08   Gradle build finished in 19 s 659 ms
  00:08   Install successfully finished in 584 ms.: App restart successful without requiring a re-install.
  </code></pre>
  
  <p>*** edited after changed ADB port</p>
  
  <p>I changed ANDROID_ADB_SERVER_PORT to 5038 in Windows Environment and restart Android Studio and I still see some 5037 waiting for connection.</p>
  
  <p>After changed Environemnt Variable ANDROID_ADB_SERVER_PORT in Windows </p>
  
  <pre><code>C:\Users\&gt;netstat -ano | findstr "5037"
    TCP    127.0.0.1:5037         127.0.0.1:54643        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54671        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:54673        TIME_WAIT       0
    TCP    127.0.0.1:5037         127.0.0.1:55204        TIME_WAIT       0
    TCP    127.0.0.1:54602        127.0.0.1:5037         TIME_WAIT       0
    TCP    127.0.0.1:54631        127.0.0.1:5037         TIME_WAIT       0
  
  C:\Users\&gt;netstat -ano | findstr "5038"
    TCP    127.0.0.1:5038         0.0.0.0:0              LISTENING       7912
    TCP    127.0.0.1:5038         127.0.0.1:55238        ESTABLISHED     7912
    TCP    127.0.0.1:55238        127.0.0.1:5038         ESTABLISHED     11368
  </code></pre>