diff --git a/src/AppAuthentication/Constants.cs b/src/AppAuthentication/Constants.cs
index 2af120d..29c2163 100644
--- a/src/AppAuthentication/Constants.cs
+++ b/src/AppAuthentication/Constants.cs
@@ -9,7 +9,7 @@ internal static class Constants
 
         public static readonly string MsiAppServiceSecretEnv = "MSI_SECRET";
 
-        public static readonly string MsiContinerUrl = "host.docker.internal";
+        public static readonly string MsiContainerUrl = "host.docker.internal";
 
         public static readonly string HostUrl = "http://{0}:{1}/";
 
diff --git a/src/AppAuthentication/EnvironmentHostedService.cs b/src/AppAuthentication/EnvironmentHostedService.cs
index 47d125a..eb1c52d 100644
--- a/src/AppAuthentication/EnvironmentHostedService.cs
+++ b/src/AppAuthentication/EnvironmentHostedService.cs
@@ -18,7 +18,7 @@ public Task StartAsync(CancellationToken cancellationToken)
         {
             Environment.SetEnvironmentVariable(
                 Constants.MsiAppServiceEndpointEnv,
-                $"{string.Format(Constants.HostUrl,Constants.MsiContinerUrl,_options.Port)}{Constants.MsiEndpoint}",
+                $"{string.Format(Constants.HostUrl,Constants.MsiContainerUrl,_options.Port)}{Constants.MsiEndpoint}",
                 EnvironmentVariableTarget.User);
 
             Environment.SetEnvironmentVariable(
diff --git a/src/AppAuthentication/Helpers/ConsoleHandler.cs b/src/AppAuthentication/Helpers/ConsoleHandler.cs
index 9b0b403..a69c04e 100644
--- a/src/AppAuthentication/Helpers/ConsoleHandler.cs
+++ b/src/AppAuthentication/Helpers/ConsoleHandler.cs
@@ -63,8 +63,19 @@ internal static string GetUserSecretsId()
 
         internal static int GetRandomUnusedPort()
         {
-            var listener = new TcpListener(IPAddress.Loopback, 5050);
-            listener.Start();
+            TcpListener listener = null;
+
+            try
+            {
+                listener = new TcpListener(IPAddress.Loopback, 5050);
+                listener.Start();
+            }
+            catch (Exception)
+            {
+                listener = new TcpListener(IPAddress.Loopback, 0);
+                listener.Start();
+            }
+
             var port = ((IPEndPoint)listener.LocalEndpoint).Port;
             listener.Stop();
             return port;
diff --git a/src/AppAuthentication/RunCommand.cs b/src/AppAuthentication/RunCommand.cs
index a3cf6c6..5694b1a 100644
--- a/src/AppAuthentication/RunCommand.cs
+++ b/src/AppAuthentication/RunCommand.cs
@@ -48,7 +48,7 @@ private async Task<int> OnExecuteAsync()
             var builderConfig = new WebHostBuilderOptions
             {
                 Authority = Authority,
-                HostingEnviroment = !string.IsNullOrWhiteSpace(HostingEnviroment) ? HostingEnviroment : "Development",
+                HostingEnvironment = !string.IsNullOrWhiteSpace(HostingEnviroment) ? HostingEnviroment : "Development",
                 Resource = !string.IsNullOrWhiteSpace(Resource) ? Resource : "https://vault.azure.net/",
                 Verbose = Verbose,
                 ConfigFile = ConfigFile,
diff --git a/src/AppAuthentication/WebHostBuilderExtensions.cs b/src/AppAuthentication/WebHostBuilderExtensions.cs
index 031309f..df88718 100644
--- a/src/AppAuthentication/WebHostBuilderExtensions.cs
+++ b/src/AppAuthentication/WebHostBuilderExtensions.cs
@@ -15,7 +15,7 @@ internal static WebHostBuilder CreateDefaultBuilder(WebHostBuilderOptions option
         {
             var builder = new WebHostBuilder();
 
-            builder.UseEnvironment(options.HostingEnviroment);
+            builder.UseEnvironment(options.HostingEnvironment);
             var fullPath = Directory.GetCurrentDirectory();
 
             if (!string.IsNullOrWhiteSpace(Path.GetDirectoryName(options.ConfigFile)))
@@ -38,7 +38,7 @@ internal static WebHostBuilder CreateDefaultBuilder(WebHostBuilderOptions option
 
             // appsettings file or others
             config.AddJsonFile(Path.Combine(fullPath, $"{(defaultConfigName).Split(".")[0]}.json"), optional: true)
-                  .AddJsonFile(Path.Combine(fullPath, $"{(defaultConfigName).Split(".")[0]}.{options.HostingEnviroment}.json"), optional: true);
+                  .AddJsonFile(Path.Combine(fullPath, $"{(defaultConfigName).Split(".")[0]}.{options.HostingEnvironment}.json"), optional: true);
 
             if (options.Arguments != null)
             {
diff --git a/src/AppAuthentication/WebHostBuilderOptions.cs b/src/AppAuthentication/WebHostBuilderOptions.cs
index f36c713..8aed569 100644
--- a/src/AppAuthentication/WebHostBuilderOptions.cs
+++ b/src/AppAuthentication/WebHostBuilderOptions.cs
@@ -13,9 +13,9 @@ internal class WebHostBuilderOptions
         public string Authority { get; set; }
 
         /// <summary>
-        /// Specify environment.
+        /// Specify Environment.
         /// </summary>
-        public string HostingEnviroment { get; set; }
+        public string HostingEnvironment { get; set; }
 
         public bool Verbose { get; set; }