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 Map Server/packets/WorldPackets/Receive/ErrorPacket.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FFXIVClassic_Map_Server.packets.WorldPackets.Receive
+{
+    class ErrorPacket
+    {
+        public uint errorCode;
+       
+        public bool invalidPacket = false;
+
+        public ErrorPacket(byte[] data)
+        {
+            using (MemoryStream mem = new MemoryStream(data))
+            {
+                using (BinaryReader binReader = new BinaryReader(mem))
+                {
+                    try
+                    {
+                        errorCode = binReader.ReadUInt32();                        
+                    }
+                    catch (Exception)
+                    {
+                        invalidPacket = true;
+                    }
+                }
+            }
+
+        }
+    }
+}