diff --git a/Source/Client/Persistent/MapPortalPatches.cs b/Source/Client/Persistent/MapPortalPatches.cs
new file mode 100644
index 00000000..1cdfa246
--- /dev/null
+++ b/Source/Client/Persistent/MapPortalPatches.cs
@@ -0,0 +1,99 @@
+using HarmonyLib;
+using RimWorld;
+using UnityEngine;
+using Verse;
+
+namespace Multiplayer.Client.Persistent;
+
+[HarmonyPatch(typeof(Widgets), nameof(Widgets.ButtonTextWorker))]
+static class MakeMapPortalCancelButtonRed
+{
+    static void Prefix(string label, ref bool __state)
+    {
+        if (MapPortalProxy.drawing == null) return;
+        if (label != "CancelButton".Translate()) return;
+
+        GUI.color = new Color(1f, 0.3f, 0.35f);
+        __state = true;
+    }
+
+    static void Postfix(bool __state, ref Widgets.DraggableResult __result)
+    {
+        if (!__state) return;
+
+        GUI.color = Color.white;
+        if (__result.AnyPressed())
+        {
+            MapPortalProxy.drawing.Session?.Remove();
+            __result = Widgets.DraggableResult.Idle;
+        }
+    }
+}
+
+[HarmonyPatch(typeof(Widgets), nameof(Widgets.ButtonTextWorker))]
+static class MapPortalHandleReset
+{
+    static void Prefix(string label, ref bool __state)
+    {
+        if (MapPortalProxy.drawing == null) return;
+        if (label != "ResetButton".Translate()) return;
+
+        __state = true;
+    }
+
+    static void Postfix(bool __state, ref Widgets.DraggableResult __result)
+    {
+        if (!__state) return;
+
+        if (__result.AnyPressed())
+        {
+            MapPortalProxy.drawing.Session?.Reset();
+            __result = Widgets.DraggableResult.Idle;
+        }
+    }
+}
+
+[HarmonyPatch(typeof(Dialog_EnterPortal), nameof(Dialog_EnterPortal.TryAccept))]
+static class TryAcceptMapPortal
+{
+    static bool Prefix(Dialog_EnterPortal __instance)
+    {
+        if (Multiplayer.InInterface && __instance is MapPortalProxy mapPortal)
+        {
+            mapPortal.Session?.TryAccept();
+            return false;
+        }
+
+        return true;
+    }
+}
+
+[HarmonyPatch(typeof(Dialog_EnterPortal), nameof(Dialog_EnterPortal.AddToTransferables))]
+static class CancelMapPortalAddItems
+{
+    static bool Prefix(Dialog_EnterPortal __instance)
+    {
+        if (__instance is MapPortalProxy { itemsReady: true } mp)
+        {
+            // Sets the transferables list back to the session list
+            // as it gets reset in CalculateAndRecacheTransferables
+            mp.transferables = mp.Session.transferables;
+            return false;
+        }
+
+        return true;
+    }
+}
+
+static class OpenMapPortalSessionDialog
+{
+    [MpPrefix(typeof(MapPortal), nameof(MapPortal.GetGizmos), 0)]
+    static bool Prefix(MapPortal __instance)
+    {
+        if (Multiplayer.Client == null)
+            return true;
+
+        MapPortalSession.OpenOrCreateSession(__instance);
+        return false;
+    }
+}
diff --git a/Source/Client/Persistent/MapPortalProxy.cs b/Source/Client/Persistent/MapPortalProxy.cs
new file mode 100644
index 00000000..0dfb7fc7
--- /dev/null
+++ b/Source/Client/Persistent/MapPortalProxy.cs
@@ -0,0 +1,32 @@
+using RimWorld;
+using UnityEngine;
+
+namespace Multiplayer.Client.Persistent;
+
+public class MapPortalProxy(MapPortal portal) : Dialog_EnterPortal(portal), ISwitchToMap
+{
+    public static MapPortalProxy drawing;
+    public bool itemsReady = false;
+
+    public MapPortalSession Session => portal.Map.MpComp().sessionManager.GetFirstOfType<MapPortalSession>();
+
+    public override void DoWindowContents(Rect inRect)
+    {
+        drawing = this;
+        var session = Session;
+        SyncSessionWithTransferablesMarker.DrawnSessionWithTransferables = session;
+
+        try
+        {
+            if (session == null)
+                Close();
+
+            base.DoWindowContents(inRect);
+        }
+        finally
+        {
+            drawing = null;
+            SyncSessionWithTransferablesMarker.DrawnSessionWithTransferables = null;
+        }
+    }
+}
diff --git a/Source/Client/Persistent/MapPortalSession.cs b/Source/Client/Persistent/MapPortalSession.cs
new file mode 100644
index 00000000..4e64623c
--- /dev/null
+++ b/Source/Client/Persistent/MapPortalSession.cs
@@ -0,0 +1,127 @@
+using System.Collections.Generic;
+using System.Linq;
+using Multiplayer.API;
+using RimWorld;
+using Verse;
+
+namespace Multiplayer.Client.Persistent;
+
+public class MapPortalSession : ExposableSession, ISessionWithTransferables, ISessionWithCreationRestrictions
+{
+    public MapPortal portal;
+    public List<TransferableOneWay> transferables;
+
+    public override Map Map => portal.Map;
+
+    public MapPortalSession(Map _) : base(null)
+    {
+        // Mandatory constructor
+    }
+
+    public MapPortalSession(MapPortal portal) : base(null)
+    {
+        this.portal = portal;
+
+        AddItems();
+    }
+
+    private void AddItems()
+    {
+        var dialog = new MapPortalProxy(portal);
+
+        // Init code taken from Dialog_EnterPortal.PostOpen
+        dialog.CalculateAndRecacheTransferables();
+
+        transferables = dialog.transferables;
+    }
+
+    public override bool IsCurrentlyPausing(Map map) => Map == map;
+
+    public override FloatMenuOption GetBlockingWindowOptions(ColonistBar.Entry entry)
+    {
+        if (entry.map != Map)
+            return null;
+
+        return new FloatMenuOption("MpMapPortalSession".Translate(portal?.Label), () =>
+        {
+            SwitchToMapOrWorld(Map);
+            OpenWindow();
+        });
+    }
+
+    public static void OpenOrCreateSession(MapPortal portal)
+    {
+        var session = portal.Map.MpComp().sessionManager.AllSessions
+            .OfType<MapPortalSession>()
+            .FirstOrDefault(s => s.portal == portal);
+        if (session == null)
+            CreateSession(portal);
+        else
+            session.OpenWindow();
+    }
+
+    [SyncMethod]
+    private static void CreateSession(MapPortal portal)
+    {
+        var map = portal.Map;
+        var manager = map.MpComp().sessionManager;
+        var session = manager.GetOrAddSession(new MapPortalSession(portal));
+
+        // Shouldn't happen and is here for safety.
+        if (session == null)
+            Log.Error($"Failed creating session of type {nameof(MapPortalSession)}.");
+        else if (MP.IsExecutingSyncCommandIssuedBySelf)
+            session.OpenWindow();
+    }
+
+    [SyncMethod]
+    public void TryAccept()
+    {
+        // There's not a single situation where TryAccept would return false.
+        // However, it will likely be used by prefixes added by mods.
+        if (PrepareDummyDialog().TryAccept())
+            Remove();
+    }
+
+    [SyncMethod]
+    public void Reset() => transferables.ForEach(t => t.CountToTransfer = 0);
+
+    [SyncMethod]
+    public void Remove() => Map.MpComp().sessionManager.RemoveSession(this);
+
+    public void OpenWindow(bool sound = true)
+    {
+        var dialog = PrepareDummyDialog();
+        if (!sound)
+            dialog.soundAppear = null;
+
+        Find.WindowStack.Add(dialog);
+    }
+
+    private MapPortalProxy PrepareDummyDialog()
+    {
+        return new MapPortalProxy(portal)
+        {
+            itemsReady = true,
+            transferables = transferables,
+        };
+    }
+
+    public override void ExposeData()
+    {
+        base.ExposeData();
+
+        Scribe_Collections.Look(ref transferables, "transferables", LookMode.Deep);
+        Scribe_References.Look(ref portal, "portal");
+    }
+
+    public Transferable GetTransferableByThingId(int thingId)
+        => transferables.Find(tr => tr.things.Any(t => t.thingIDNumber == thingId));
+
+    public void Notify_CountChanged(Transferable tr)
+    {
+        // There should not really be a need to clear caches, as this dialog does not really have any.
+    }
+
+    public bool CanExistWith(Session other) => other is not MapPortalSession portalSession || portalSession.portal != portal;
+}