diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index 61a9130..fb7f4a8 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="1.8" />
+    <bytecodeTargetLevel target="11" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 23a89bb..bb80ebf 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -4,10 +4,10 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
-        <option name="testRunner" value="PLATFORM" />
+        <option name="testRunner" value="GRADLE" />
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleJvm" value="1.8" />
+        <option name="gradleJvm" value="Android Studio default JDK" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
@@ -15,7 +15,6 @@
           </set>
         </option>
         <option name="resolveModulePerSourceSet" value="false" />
-        <option name="useQualifiedModuleNames" value="true" />
       </GradleProjectSettings>
     </option>
   </component>
diff --git a/.idea/misc.xml b/.idea/misc.xml
index a8f62cd..9efabab 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,5 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="DesignSurface">
+    <option name="filePathToZoomLevelMap">
+      <map>
+        <entry key="app/src/main/res/layout/layout.xml" value="0.35989583333333336" />
+        <entry key="app/src/main/res/xml/network_security_config.xml" value="0.35989583333333336" />
+      </map>
+    </option>
+  </component>
   <component name="NullableNotNullManager">
     <option name="myDefaultNullable" value="org.jetbrains.annotations.Nullable" />
     <option name="myDefaultNotNull" value="androidx.annotation.NonNull" />
@@ -25,7 +33,7 @@
     </option>
     <option name="myNotNulls">
       <value>
-        <list size="13">
+        <list size="14">
           <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
           <item index="1" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
           <item index="2" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
@@ -39,11 +47,12 @@
           <item index="10" class="java.lang.String" itemvalue="org.eclipse.jdt.annotation.NonNull" />
           <item index="11" class="java.lang.String" itemvalue="io.reactivex.annotations.NonNull" />
           <item index="12" class="java.lang.String" itemvalue="io.reactivex.rxjava3.annotations.NonNull" />
+          <item index="13" class="java.lang.String" itemvalue="lombok.NonNull" />
         </list>
       </value>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
deleted file mode 100644
index 7f68460..0000000
--- a/.idea/runConfigurations.xml
+++ /dev/null
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="RunConfigurationProducerService">
-    <option name="ignoredProducers">
-      <set>
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
-      </set>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index c010a38..6b91119 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -21,8 +21,8 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility JavaVersion.VERSION_11
+        targetCompatibility JavaVersion.VERSION_11
     }
 }
 
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index ae3108f..a57f5bc 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -7,12 +7,13 @@
     <uses-permission android:name="android.permission.INTERNET" />
 
     <application
-        android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme">
+        android:theme="@style/AppTheme"
+        android:networkSecurityConfig="@xml/network_security_config">
+        <!--android:usesCleartextTraffic="true"-->
 
         <provider
             android:name="androidx.core.content.FileProvider"
diff --git a/app/src/main/java/com/localtransfer/Transfer.java b/app/src/main/java/com/localtransfer/Transfer.java
index b4272a0..806eb6f 100644
--- a/app/src/main/java/com/localtransfer/Transfer.java
+++ b/app/src/main/java/com/localtransfer/Transfer.java
@@ -63,13 +63,21 @@ public class Transfer {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
 
         host = prefs.getString("host", null);
-        port = valueOf(prefs.getString("port", null));
         root = prefs.getString("root", null);
         local_storage = prefs.getString("local_storage", null);
         if(prefs.getBoolean("protocol", false))
             protocol = "https";
         else
             protocol = "http";
+        String portValue = prefs.getString("port", null);
+        if(portValue.equals("")){
+            if(protocol.equals("http"))
+                port = 80;
+            else if(protocol.equals("https"))
+                port = 443;
+        }
+        else
+            port = valueOf(portValue);
     }
 
     private URL checkRedirection(URL url) throws IOException {
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 6c2f8dc..e7fe80f 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -25,7 +25,7 @@
     <string name="server_protocol">Use secure https</string>
     <string name="server_host_def">www.netdldata.net</string>
     <string name="server_port">Port</string>
-    <string name="server_port_def">80</string>
+    <string name="server_port_def"></string>
     <string name="server_root">Root</string>
     <string name="server_root_def">/transfer</string>
 
diff --git a/app/src/main/res/xml/network_security_config.xml b/app/src/main/res/xml/network_security_config.xml
new file mode 100644
index 0000000..583fb1d
--- /dev/null
+++ b/app/src/main/res/xml/network_security_config.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<network-security-config>
+    <domain-config cleartextTrafficPermitted="true">
+        <domain includeSubdomains="true">netdldata.net</domain>
+    </domain-config>
+</network-security-config>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 5e3e27e..d1d64c3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.2'
+        classpath 'com.android.tools.build:gradle:7.0.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index b1f9077..3306fd7 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-all.zip