diff --git a/Source/Core/Core/NetPlayClient.h b/Source/Core/Core/NetPlayClient.h
index 3afaadd81579..7ece1a5a68b0 100644
--- a/Source/Core/Core/NetPlayClient.h
+++ b/Source/Core/Core/NetPlayClient.h
@@ -64,6 +64,9 @@ class NetPlayUI
   virtual void SetMD5Result(int pid, const std::string& result) = 0;
   virtual void AbortMD5() = 0;
 
+  virtual void OnIndexAdded(bool success, std::string error) = 0;
+  virtual void OnIndexRefreshFailed(std::string error) = 0;
+
   virtual void ShowChunkedProgressDialog(const std::string& title, u64 data_size,
                                          const std::vector<int>& players) = 0;
   virtual void HideChunkedProgressDialog() = 0;
diff --git a/Source/Core/Core/NetPlayServer.cpp b/Source/Core/Core/NetPlayServer.cpp
index 151cf2c194df..0e111aa088fe 100644
--- a/Source/Core/Core/NetPlayServer.cpp
+++ b/Source/Core/Core/NetPlayServer.cpp
@@ -183,6 +183,9 @@ void NetPlayServer::SetupIndex()
 
   if (m_traversal_client)
   {
+    if (m_traversal_client->GetState() != TraversalClient::Connected)
+      return;
+
     session.server_id = std::string(g_TraversalClient->GetHostID().data(), 8);
   }
   else
@@ -201,7 +204,13 @@ void NetPlayServer::SetupIndex()
 
   session.EncryptID(Config::Get(Config::NETPLAY_INDEX_PASSWORD));
 
-  m_index.Add(session);
+  if (m_dialog != nullptr)
+    m_dialog->OnIndexAdded(m_index.Add(session), m_index.GetLastError());
+
+  m_index.SetErrorCallback([this] {
+    if (m_dialog != nullptr)
+      m_dialog->OnIndexRefreshFailed(m_index.GetLastError());
+  });
 }
 
 // called from ---NETPLAY--- thread
diff --git a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
index 09fa19e8502e..5b0eebc9d4fe 100644
--- a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
+++ b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
@@ -393,6 +393,19 @@ void NetPlayDialog::OnChat()
   });
 }
 
+void NetPlayDialog::OnIndexAdded(bool success, const std::string error)
+{
+  DisplayMessage(success ? tr("Successfully added to the NetPlay index") :
+                           tr("Failed to add this session to the NetPlay index: %1")
+                               .arg(QString::fromStdString(error)),
+                 success ? "green" : "red");
+}
+
+void NetPlayDialog::OnIndexRefreshFailed(const std::string error)
+{
+  DisplayMessage(QString::fromStdString(error), "red");
+}
+
 void NetPlayDialog::OnStart()
 {
   if (!Settings::Instance().GetNetPlayClient()->DoAllPlayersHaveGame())
diff --git a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.h b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.h
index e6d601afaab7..39c0573340d4 100644
--- a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.h
+++ b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.h
@@ -60,6 +60,9 @@ class NetPlayDialog : public QDialog, public NetPlay::NetPlayUI
   void OnGameStartAborted() override;
   void OnGolferChanged(bool is_golfer, const std::string& golfer_name) override;
 
+  void OnIndexAdded(bool success, const std::string error) override;
+  void OnIndexRefreshFailed(const std::string error) override;
+
   bool IsRecording() override;
   std::string FindGame(const std::string& game) override;
   std::shared_ptr<const UICommon::GameFile> FindGameFile(const std::string& game) override;
diff --git a/Source/Core/UICommon/NetPlayIndex.cpp b/Source/Core/UICommon/NetPlayIndex.cpp
index 9915bb311d8e..c6ab872b4ec2 100644
--- a/Source/Core/UICommon/NetPlayIndex.cpp
+++ b/Source/Core/UICommon/NetPlayIndex.cpp
@@ -142,6 +142,8 @@ void NetPlayIndex::NotificationLoop()
     if (!json)
     {
       m_last_error = "BAD_JSON";
+      m_secret.clear();
+      m_error_callback();
       return;
     }
 
@@ -150,6 +152,8 @@ void NetPlayIndex::NotificationLoop()
     if (status != "OK")
     {
       m_last_error = std::move(status);
+      m_secret.clear();
+      m_error_callback();
       return;
     }
   }
@@ -323,3 +327,13 @@ const std::string& NetPlayIndex::GetLastError() const
 {
   return m_last_error;
 }
+
+bool NetPlayIndex::HasActiveSession() const
+{
+  return !m_secret.empty();
+}
+
+void NetPlayIndex::SetErrorCallback(std::function<void()> function)
+{
+  m_error_callback = function;
+}
diff --git a/Source/Core/UICommon/NetPlayIndex.h b/Source/Core/UICommon/NetPlayIndex.h
index b892d42a4894..f451301152dc 100644
--- a/Source/Core/UICommon/NetPlayIndex.h
+++ b/Source/Core/UICommon/NetPlayIndex.h
@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <functional>
 #include <map>
 #include <optional>
 #include <string>
@@ -46,12 +47,16 @@ class NetPlayIndex
   bool Add(NetPlaySession session);
   void Remove();
 
+  bool HasActiveSession() const;
+
   void SetPlayerCount(int player_count);
   void SetInGame(bool in_game);
   void SetGame(std::string game);
 
   const std::string& GetLastError() const;
 
+  void SetErrorCallback(std::function<void()> callback);
+
 private:
   void NotificationLoop();
 
@@ -64,4 +69,6 @@ class NetPlayIndex
   std::thread m_session_thread;
 
   Common::Event m_session_thread_exit_event;
+
+  std::function<void()> m_error_callback = nullptr;
 };