Add ChannelEnterFinishReply.

src/Syroot.Worms.OnlineWorms.Server/Client.cs

@@ -142,6 +142,7 @@ namespace Syroot.Worms.OnlineWorms.Server
 
         public void HandleChannelUnkInfo(ChannelUnkInfoQuery packet)
         {
+            // Send player rank infos.
             ChannelUnkInfoReply reply = new ChannelUnkInfoReply
             {
                 UnknownA = "Test",
@@ -158,7 +159,8 @@ namespace Syroot.Worms.OnlineWorms.Server
             }
             SendPacket(reply);
 
-            SendPacket(new RawPacket(PacketType.Channel, 0x44, (byte)0x00));
+            // This is the last channel info packet, tell the client to go to the channel screen.
+            SendPacket(new ChannelEnterFinishReply());
         }
 
 #if DEBUG

src/Syroot.Worms.OnlineWorms.Server/Net/GameConnection.cs

@@ -167,9 +167,11 @@ namespace Syroot.Worms.OnlineWorms.Server.Net
         {
             OnPrePacketSend(packet);
 
-            // Serialize the raw packet data.
+            // Serialize the raw packet data, which must consist of at least 1 byte (at least for channels).
             _sendStream.Position = 0;
             packet.Serialize(_sendStream);
+            if (_sendStream.Position == 0)
+                _sendStream.WriteByte(0);
             ushort dataSize = (ushort)_sendStream.Position;
 
             // Send the data and return success.

src/Syroot.Worms.OnlineWorms.Server/Net/Packets/ChannelEnterFinishReply.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace Syroot.Worms.OnlineWorms.Server.Net
+{
+    /// <summary>
+    /// Represents an additional server response to a <see cref="ChannelUnkInfoQuery"/>, causing the client to switch
+    /// to the channel screen (game lobby).
+    /// </summary>
+    [Packet(PacketType.Channel, 0x44)]
+    internal class ChannelEnterFinishReply : Packet
+    {
+        // ---- METHODS (INTERNAL) -------------------------------------------------------------------------------------
+
+        internal override void Deserialize(PacketStream stream) => throw new NotImplementedException();
+
+        internal override void Serialize(PacketStream stream) { }
+    }
+}

src/Syroot.Worms.OnlineWorms.Server/Net/Packets/ChannelUnkInfoReply.cs

@@ -14,7 +14,7 @@ namespace Syroot.Worms.OnlineWorms.Server.Net
 
         public string UnknownA { get; set; } // Max. 30 chars
 
-        public IList<ChannelUnkInfo> UnkInfos { get; set; } // Client always requests 20 elements.
+        public IList<ChannelUnkInfo> UnkInfos { get; set; } // Apparently ranks. Client always requests 20 elements.
 
         // ---- METHODS (INTERNAL) -------------------------------------------------------------------------------------
 
@@ -32,6 +32,9 @@ namespace Syroot.Worms.OnlineWorms.Server.Net
         }
     }
 
+    /// <summary>
+    /// Represents a player channel rank, apparently.
+    /// </summary>
     public class ChannelUnkInfo
     {
         public ushort UnknownA { get; set; }

src/Syroot.Worms.OnlineWorms.Server/OWServerConfig.json

@@ -1,5 +1,5 @@
 {
-    "IP": "87.123.189.212", // external IP sent to clients to connect to
+    "IP": "127.0.0.1", // external IP sent to clients to connect to
     "Port": 17022,
     "Name": "Online Worms Private Server",
     "Region": "Global",