If a player tries to zone to a offline server they will see a standard error message. Also a reconnection attempt will be made on a disconnected server.

FFXIVClassic World Server/Packets/WorldPackets/Send/ErrorPacket.cs

@@ -0,0 +1,37 @@
+using FFXIVClassic.Common;
+using FFXIVClassic_World_Server.DataObjects;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FFXIVClassic_World_Server.Packets.WorldPackets.Send
+{
+    class ErrorPacket
+    {
+        public const ushort OPCODE = 0x100A;
+        public const uint PACKET_SIZE = 0x24;
+
+        public static SubPacket BuildPacket(Session session, uint errorCode)
+        {
+            byte[] data = new byte[PACKET_SIZE - 0x20];
+
+            using (MemoryStream mem = new MemoryStream(data))
+            {
+                using (BinaryWriter binWriter = new BinaryWriter(mem))
+                {
+                    try
+                    {
+                        binWriter.Write((UInt32)errorCode);
+                    }
+                    catch (Exception)
+                    { }
+                }
+            }
+
+            return new SubPacket(true, OPCODE, 0, session.sessionId, data);
+        }
+    }
+}