diff --git a/docker-compose.yml b/docker-compose.yml
index 38acbef..b1c75d6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -118,7 +118,11 @@ services:
     environment:
       SERVER_PORT: 4000
       DEV_LOGIN_BYPASS: "true"
-      LOGIN_PACKET_TRACE: "true"
+      LOGIN_PACKET_TRACE: "false"
+      LOGIN_CHANNEL_OLD_FORMAT: "true"
+      LOGIN_CHANNEL_MINIMAL: "false"
+      LOGIN_CHANNEL_SEND_BOTH: "false"
+      LOGIN_PLAINTEXT_SEND: "false"
       MASTER_IP: master
       MASTER_PORT: 20500
       DB_SERVER_IP: database
diff --git a/srcs/LoginServer/Handlers/LoginPacketsExtensions.cs b/srcs/LoginServer/Handlers/LoginPacketsExtensions.cs
index 3e26a0f..16d467c 100644
--- a/srcs/LoginServer/Handlers/LoginPacketsExtensions.cs
+++ b/srcs/LoginServer/Handlers/LoginPacketsExtensions.cs
@@ -2,7 +2,9 @@
 // 
 // Developed by NosWings Team
 
+using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Text;
 using LoginServer.Network;
 using PhoenixLib.Logging;
@@ -22,12 +24,9 @@ namespace LoginServer.Handlers
             string lastGroup = string.Empty;
             int worldGroupCount = 0;
             var packetBuilder = new StringBuilder();
-            packetBuilder.AppendFormat($"NsTeST  {(byte)region} {sessionId} 2 ");
 
-            packetBuilder.Append(
-                isOldLogin
-                    ? $"-99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 {encryptionKey} "
-                    : $"-99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 -99 0 {encryptionKey} ");
+            string serverlist = string.Join(" ", Enumerable.Range(0, 60).Select(_ => "-99 0"));
+            packetBuilder.AppendFormat($"NsTeST {(byte)region} {sessionId} {serverlist} {encryptionKey} ");
 
             foreach (SerializableGameServer world in worldServers)
             {
diff --git a/srcs/LoginServer/Handlers/TypedCredentialsLogin0577PacketHandler.cs b/srcs/LoginServer/Handlers/TypedCredentialsLogin0577PacketHandler.cs
index 777c857..1872fe5 100644
--- a/srcs/LoginServer/Handlers/TypedCredentialsLogin0577PacketHandler.cs
+++ b/srcs/LoginServer/Handlers/TypedCredentialsLogin0577PacketHandler.cs
@@ -149,8 +149,7 @@ namespace LoginServer.Handlers
                     break;
 
                 default:
-                    // Temporary: do not block logins by maintenance flag while local setup is being validated.
-                    if (false && _maintenanceManager.IsMaintenanceActive && loadedAccount.Authority < AuthorityType.GameMaster)
+                    if (_maintenanceManager.IsMaintenanceActive && loadedAccount.Authority < AuthorityType.GameMaster)
                     {
                         session.SendPacket(session.GenerateFailcPacket(LoginFailType.Maintenance));
                         return;
@@ -187,7 +186,14 @@ namespace LoginServer.Handlers
                         return;
                     }
 
-                    session.SendChannelPacketList(connectedSession.EncryptionKey, loadedAccount.Name, RegionLanguageType.EN, worldServersResponse.WorldServers, true);
+                    bool oldFormat = !string.Equals(Environment.GetEnvironmentVariable("LOGIN_CHANNEL_OLD_FORMAT"), "false", StringComparison.OrdinalIgnoreCase);
+                    session.SendChannelPacketList(connectedSession.EncryptionKey, loadedAccount.Name, RegionLanguageType.EN, worldServersResponse.WorldServers, oldFormat);
+
+                    bool sendBoth = string.Equals(Environment.GetEnvironmentVariable("LOGIN_CHANNEL_SEND_BOTH"), "true", StringComparison.OrdinalIgnoreCase);
+                    if (sendBoth)
+                    {
+                        session.SendChannelPacketList(connectedSession.EncryptionKey, loadedAccount.Name, RegionLanguageType.EN, worldServersResponse.WorldServers, !oldFormat);
+                    }
                     session.Disconnect();
                     break;
             }
diff --git a/srcs/LoginServer/Handlers/TypedCredentialsLoginPacketHandler.cs b/srcs/LoginServer/Handlers/TypedCredentialsLoginPacketHandler.cs
index 2e4df72..893f420 100644
--- a/srcs/LoginServer/Handlers/TypedCredentialsLoginPacketHandler.cs
+++ b/srcs/LoginServer/Handlers/TypedCredentialsLoginPacketHandler.cs
@@ -140,8 +140,7 @@ namespace LoginServer.Handlers
                     break;
 
                 default:
-                    // Temporary: do not block logins by maintenance flag while local setup is being validated.
-                    if (false && _maintenanceManager.IsMaintenanceActive && loadedAccount.Authority < AuthorityType.GameMaster)
+                    if (_maintenanceManager.IsMaintenanceActive && loadedAccount.Authority < AuthorityType.GameMaster)
                     {
                         session.SendPacket(session.GenerateFailcPacket(LoginFailType.Maintenance));
                         return;
@@ -178,7 +177,14 @@ namespace LoginServer.Handlers
                         return;
                     }
 
-                    session.SendChannelPacketList(connectedSession.EncryptionKey, loadedAccount.Name, RegionLanguageType.EN, worldServersResponse.WorldServers, true);
+                    bool oldFormat = !string.Equals(Environment.GetEnvironmentVariable("LOGIN_CHANNEL_OLD_FORMAT"), "false", StringComparison.OrdinalIgnoreCase);
+                    session.SendChannelPacketList(connectedSession.EncryptionKey, loadedAccount.Name, RegionLanguageType.EN, worldServersResponse.WorldServers, oldFormat);
+
+                    bool sendBoth = string.Equals(Environment.GetEnvironmentVariable("LOGIN_CHANNEL_SEND_BOTH"), "true", StringComparison.OrdinalIgnoreCase);
+                    if (sendBoth)
+                    {
+                        session.SendChannelPacketList(connectedSession.EncryptionKey, loadedAccount.Name, RegionLanguageType.EN, worldServersResponse.WorldServers, !oldFormat);
+                    }
                     session.Disconnect();
                     break;
             }
diff --git a/srcs/LoginServer/Network/LoginClientSession.cs b/srcs/LoginServer/Network/LoginClientSession.cs
index f1ba811..f2d382f 100644
--- a/srcs/LoginServer/Network/LoginClientSession.cs
+++ b/srcs/LoginServer/Network/LoginClientSession.cs
@@ -28,7 +28,18 @@ namespace LoginServer.Network
 
         public string IpAddress { get; private set; }
 
-        public void SendPacket(string packet) => Send(NostaleLoginEncrypter.Encode(packet, Encoding.Default).ToArray());
+        public void SendPacket(string packet)
+        {
+            bool plainSend = string.Equals(Environment.GetEnvironmentVariable("LOGIN_PLAINTEXT_SEND"), "true", StringComparison.OrdinalIgnoreCase);
+            if (plainSend)
+            {
+                // Debug compatibility mode: send plain text packet with LF terminator.
+                Send(Encoding.Default.GetBytes(packet + "\n"));
+                return;
+            }
+
+            Send(NostaleLoginEncrypter.Encode(packet, Encoding.Default).ToArray());
+        }
 
         protected override void OnConnected()
         {