diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Interface/IRepository.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Interface/IRepository.cs
new file mode 100644
index 0000000..dadb0c5
--- /dev/null
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Interface/IRepository.cs
@@ -0,0 +1,13 @@
+using System.Linq;
+
+namespace Playvoi.Server.Data.Interface;
+
+public interface IRepository<T> where T : class
+{
+    void Add(T entity);
+    void Delete(string id);
+    T Get(string id);
+    void Update(T entity);
+    IQueryable<T> GetQuery();
+    ushort GetTotalCount();
+}
\ No newline at end of file
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Interface/IUserRepository.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Interface/IUserRepository.cs
new file mode 100644
index 0000000..4a040a4
--- /dev/null
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Interface/IUserRepository.cs
@@ -0,0 +1,9 @@
+using Playvoi.Server.Data.Model;
+
+namespace Playvoi.Server.Data.Interface;
+
+public interface IUserRepository : IRepository<User>
+{
+    public void SetOnline(string id);
+    public void SetOffline(string id);
+}
\ No newline at end of file
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Model/User.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Model/User.cs
new file mode 100644
index 0000000..887d921
--- /dev/null
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Model/User.cs
@@ -0,0 +1,9 @@
+namespace Playvoi.Server.Data.Model;
+
+public class User
+{
+    public string Id { get; set; }
+    public string Password { get; set; }
+    public ushort Score { get; set; }
+    public bool IsOnline { get; set; }
+}
\ No newline at end of file
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Repository/InMemoryUserRepository.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Repository/InMemoryUserRepository.cs
new file mode 100644
index 0000000..2d234c9
--- /dev/null
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Data/Repository/InMemoryUserRepository.cs
@@ -0,0 +1,75 @@
+using System.Collections.Generic;
+using System.Linq;
+using Playvoi.Server.Data.Interface;
+using Playvoi.Server.Data.Model;
+
+namespace Playvoi.Server.Data.Repository;
+
+public class InMemoryUserRepository : IUserRepository
+{
+    private readonly List<User> _entities;
+
+    public InMemoryUserRepository()
+    {
+        _entities = new List<User>()
+        {
+            new User()
+            {
+                Id = "ehm",
+                Password = "test",
+                IsOnline = true,
+                Score = 100
+            },
+            new User()
+            {
+                Id = "hme",
+                Password = "test123",
+                IsOnline = false,
+                Score = 230
+            }
+        };
+    }
+
+    // Ogrenmek için ileride Database ile değişimi yapilacak.
+    public void Add(User entity)
+    {
+        _entities.Add(entity);
+    }
+
+    public void Delete(string id)
+    {
+        var entity = _entities.FirstOrDefault(x => x.Id == id);
+        _entities.Remove(entity);
+    }
+
+    public User Get(string id)
+    {
+        return _entities.FirstOrDefault(x => x.Id == id);
+    }
+
+    public void Update(User entity)
+    {
+        var dbIndex = _entities.FindIndex(e => e.Id == entity.Id);
+        _entities[dbIndex] = entity;
+    }
+
+    public IQueryable<User> GetQuery()
+    {
+        return _entities.AsQueryable();
+    }
+
+    public ushort GetTotalCount()
+    {
+        return (ushort)_entities.Count(x => x.IsOnline);
+    }
+
+    public void SetOnline(string id)
+    {
+        _entities.FirstOrDefault(e => e.Id == id).IsOnline = true;
+    }
+
+    public void SetOffline(string id)
+    {
+        _entities.FirstOrDefault(e => e.Id == id).IsOnline = false;
+    }
+}
\ No newline at end of file
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Games/ServerConnection.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Games/ServerConnection.cs
new file mode 100644
index 0000000..0bf0526
--- /dev/null
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Games/ServerConnection.cs
@@ -0,0 +1,13 @@
+using System;
+using LiteNetLib;
+using Playvoi.Server.Data.Model;
+
+namespace Playvoi.Server.Games;
+
+public class ServerConnection
+{
+    public int ConnectionId { get; set; }
+    public User User { get; set; }
+    public NetPeer Peer { get; set; }
+    public Guid? GameId { get; set; }
+}
\ No newline at end of file
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Games/UsersManager.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Games/UsersManager.cs
new file mode 100644
index 0000000..f4c9873
--- /dev/null
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Games/UsersManager.cs
@@ -0,0 +1,48 @@
+using System.Collections.Generic;
+using Playvoi.Server.Data.Interface;
+using Playvoi.Server.Data.Model;
+
+namespace Playvoi.Server.Games;
+
+public class UsersManager
+{
+    private Dictionary<int, ServerConnection> _connections;
+    private readonly IUserRepository _userRepository;
+
+    public UsersManager(IUserRepository userRepository)
+    {
+        _userRepository = userRepository;
+    }
+    public bool LoginOrRegister(int connectionId, string username, string password)
+    {
+        var dbUser = _userRepository.Get(username);
+        if (username != null)
+        {
+            //Login
+            if (dbUser.Password != password)
+            {
+                return false;
+            }
+        }
+        // Register
+        if (dbUser == null)
+        {
+            var newUser = new User()
+            {
+                Id = username,
+                Password = password,
+                IsOnline = true,
+                Score = 0
+            };
+            _userRepository.Add(newUser);
+            dbUser = newUser;
+        }
+        // Login and set online
+        if (_connections.ContainsKey(connectionId))
+        {
+            dbUser.IsOnline = true;
+            _connections[connectionId].User = dbUser;
+        }
+        return true;
+    }
+}
\ No newline at end of file
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Infrastructure/Container.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Infrastructure/Container.cs
index d852096..24884a8 100644
--- a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Infrastructure/Container.cs
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Infrastructure/Container.cs
@@ -1,6 +1,8 @@
 using System;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
+using Playvoi.Server.Data.Interface;
+using Playvoi.Server.Data.Repository;
 using Playvoi.Server.Extensions;
 using Playvoi.Server.Shared.Registry;
 
@@ -22,6 +24,7 @@ public static class Container
         services.AddSingleton<NetworkServer>();
         services.AddSingleton<PacketRegistry>();
         services.AddSingleton<HandlerRegistry>();
+        services.AddSingleton<IUserRepository, InMemoryUserRepository>();
         services.AddPacketHandlers();
     }
 }
\ No newline at end of file
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/PacketHandlers/AuthRequestHandler.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/PacketHandlers/AuthRequestHandler.cs
index 99f6031..8cd3711 100644
--- a/Playvoi.Server/Playvoi.Server/Playvoi.Server/PacketHandlers/AuthRequestHandler.cs
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/PacketHandlers/AuthRequestHandler.cs
@@ -1,5 +1,8 @@
 using _Network.Shared;
 using _Network.Shared.Interface;
+using _Network.Shared.Packets.ClientServer;
+using Microsoft.Extensions.Logging;
+using Playvoi.Server.Games;
 using Playvoi.Server.Shared.Attributes;
 using Playvoi.Server.Shared.Interface;
 
@@ -7,8 +10,24 @@ namespace Playvoi.Server.PacketHandlers;
 [HandlerRegister(PacketType.AuthRequest)]
 public class AuthRequestHandler : IPacketHandler
 {
+    private readonly ILogger<AuthRequestHandler> _logger;
+    private readonly UsersManager _userManager;
+
+    public AuthRequestHandler(ILogger<AuthRequestHandler> logger, UsersManager userManager)
+    {
+        _logger = logger;
+        _userManager = userManager;
+    }
     public void Handle(INetPacket packet, int connectionId)
     {
+        var message = (NetAuthRequest)packet;
+        _logger.LogInformation($"Received login request for user with pass: {message.Username}:{message.Password}");
         
+        // log
+
+        // login or register
+        var loginSuccess = _userManager.LoginOrRegister(connectionId, message.Username, message.Password);
+        // if success -> send back N_OAuth
+        // else send back Net_OAuthFail meessage
     }
 }
\ No newline at end of file
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Shared/Packets/ClientServer/NetAuthRequest.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Shared/Packets/ClientServer/NetAuthRequest.cs
index d9bb865..a30875f 100644
--- a/Playvoi.Server/Playvoi.Server/Playvoi.Server/Shared/Packets/ClientServer/NetAuthRequest.cs
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/Shared/Packets/ClientServer/NetAuthRequest.cs
@@ -3,7 +3,7 @@ using LiteNetLib.Utils;
 
 namespace _Network.Shared.Packets.ClientServer
 {
-    public class NetAuthRequest : INetPacket
+    public struct NetAuthRequest : INetPacket
     {
         public PacketType Type => PacketType.AuthRequest;
         public string Username { get; set; }
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/bin/Release/net9.0/Playvoi.Server.dll b/Playvoi.Server/Playvoi.Server/Playvoi.Server/bin/Release/net9.0/Playvoi.Server.dll
index f1609b5..ba11cac 100644
Binary files a/Playvoi.Server/Playvoi.Server/Playvoi.Server/bin/Release/net9.0/Playvoi.Server.dll and b/Playvoi.Server/Playvoi.Server/Playvoi.Server/bin/Release/net9.0/Playvoi.Server.dll differ
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/bin/Release/net9.0/Playvoi.Server.exe b/Playvoi.Server/Playvoi.Server/Playvoi.Server/bin/Release/net9.0/Playvoi.Server.exe
index 925fa5e..bd87207 100644
Binary files a/Playvoi.Server/Playvoi.Server/Playvoi.Server/bin/Release/net9.0/Playvoi.Server.exe and b/Playvoi.Server/Playvoi.Server/Playvoi.Server/bin/Release/net9.0/Playvoi.Server.exe differ
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.AssemblyInfo.cs b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.AssemblyInfo.cs
index 28e1151..65e30e2 100644
--- a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.AssemblyInfo.cs
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.AssemblyInfo.cs
@@ -13,7 +13,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("Playvoi.Server")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Release")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+be00b3542e14d49b00f7373a13e89fcb423c17b8")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+b0197489b16432dc1deafec8d7ad46fc335f2e41")]
 [assembly: System.Reflection.AssemblyProductAttribute("Playvoi.Server")]
 [assembly: System.Reflection.AssemblyTitleAttribute("Playvoi.Server")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.AssemblyInfoInputs.cache b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.AssemblyInfoInputs.cache
index d8af400..f86a794 100644
--- a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.AssemblyInfoInputs.cache
+++ b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.AssemblyInfoInputs.cache
@@ -1 +1 @@
-54014dd7ac4359d492a4b0ddbbccc8d1396884df8feab61e3beddc83d95508b9
+57beb62731dfeffdc95d0f7c3f52acf0b72edd970c67dadd581310b517f12af2
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.dll b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.dll
index f1609b5..ba11cac 100644
Binary files a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.dll and b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/Playvoi.Server.dll differ
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/apphost.exe b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/apphost.exe
index 925fa5e..bd87207 100644
Binary files a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/apphost.exe and b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/apphost.exe differ
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/ref/Playvoi.Server.dll b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/ref/Playvoi.Server.dll
index 1cf3d85..002a5fe 100644
Binary files a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/ref/Playvoi.Server.dll and b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/ref/Playvoi.Server.dll differ
diff --git a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/refint/Playvoi.Server.dll b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/refint/Playvoi.Server.dll
index 1cf3d85..002a5fe 100644
Binary files a/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/refint/Playvoi.Server.dll and b/Playvoi.Server/Playvoi.Server/Playvoi.Server/obj/Release/net9.0/refint/Playvoi.Server.dll differ