diff --git a/packages/core/src/handlers/login.ts b/packages/core/src/handlers/login.ts
index 721b17f66..1e843dfec 100644
--- a/packages/core/src/handlers/login.ts
+++ b/packages/core/src/handlers/login.ts
@@ -18,6 +18,7 @@ import { NetworkHandler } from "../network";
 import { ClientSystemInfo, Player } from "../entity";
 import { PlayerProperties } from "../types";
 import { PlayerJoinSignal } from "../events";
+import { AuthenticationType } from "@serenityjs/protocol/src/types/authentication-type";
 
 class LoginHandler extends NetworkHandler {
   public static readonly packet = Packet.Login;
@@ -28,7 +29,23 @@ class LoginHandler extends NetworkHandler {
     // Decode the tokens given by the client.
     // This contains the client data, identity data, and public key.
     // Along with the players XUID, display name, and uuid.
-    const { clientData, identityData } = LoginHandler.decode(packet.tokens);
+    const { clientData, identityData, authenticationType } = LoginHandler.decode(packet.tokens);
+
+    // Check if the authentication type is valid.
+    // The LoginPacket passes one of three authentication types:
+    // 0 - Standard, the player is using their own token to connect.
+    // 1 - The connection is coming from a guest split screen session using the host's token.
+    // 2 - The connection is not authenticated.
+    // By default, we do not want to allow guest or unauthenticated connections to the server.
+
+    if (authenticationType !== AuthenticationType.Full && !this.serenity.properties.allowUnsignedConnections) {
+      // Disconnect the player.
+      return this.network.disconnectConnection(
+        connection,
+        "Failed to authenticate. Make sure you are connected to Xbox Live before joining the server.",
+        DisconnectReason.NotAuthenticated
+      );
+    }
 
     // Get the clients xuid and username.
     const xuid = identityData.XUID;
@@ -165,7 +182,7 @@ class LoginHandler extends NetworkHandler {
     const clientData: ClientData = this.decoder(tokens.client);
 
     // Parse the identity data from the tokens
-    const identity: { Certificate: string } = JSON.parse(tokens.identity);
+    const identity: { AuthenticationType: number, Certificate: string } = JSON.parse(tokens.identity);
 
     // Get the identity chain from the identity data
     const chains: Array<string> = JSON.parse(identity.Certificate).chain;
@@ -187,7 +204,8 @@ class LoginHandler extends NetworkHandler {
     return {
       clientData,
       identityData,
-      publicKey
+      publicKey,
+      authenticationType: identity.AuthenticationType
     };
   }
 }
diff --git a/packages/core/src/serenity.ts b/packages/core/src/serenity.ts
index 6a71ab0b0..5f84fa58d 100644
--- a/packages/core/src/serenity.ts
+++ b/packages/core/src/serenity.ts
@@ -49,6 +49,7 @@ const DefaultSerenityProperties: SerenityProperties = {
   movementValidation: true,
   movementHorizontalThreshold: 0.4,
   movementVerticalThreshold: 0.6,
+  allowUnsignedConnections: false,
   shutdownMessage: "Server is shutting down.",
   ticksPerSecond: 20,
   debugLogging: false
diff --git a/packages/core/src/types/serenity-properties.ts b/packages/core/src/types/serenity-properties.ts
index eadb76b19..c18980a67 100644
--- a/packages/core/src/types/serenity-properties.ts
+++ b/packages/core/src/types/serenity-properties.ts
@@ -11,6 +11,7 @@ interface SerenityProperties {
   movementValidation: boolean;
   movementHorizontalThreshold: number;
   movementVerticalThreshold: number;
+  allowUnsignedConnections: boolean;
   shutdownMessage: string;
   ticksPerSecond: number;
   debugLogging: boolean;
diff --git a/packages/protocol/src/types/authentication-type.ts b/packages/protocol/src/types/authentication-type.ts
new file mode 100644
index 000000000..849e2b6c3
--- /dev/null
+++ b/packages/protocol/src/types/authentication-type.ts
@@ -0,0 +1,7 @@
+enum AuthenticationType {
+  Full = 0, // The player's own token
+  Guest = 1, // Split screen sessions, the player is using the host's token
+  SelfSigned = 2 // Not authenticated
+}
+
+export { AuthenticationType }
\ No newline at end of file
diff --git a/packages/protocol/src/types/login-data.ts b/packages/protocol/src/types/login-data.ts
index 362951a10..396e3f29a 100644
--- a/packages/protocol/src/types/login-data.ts
+++ b/packages/protocol/src/types/login-data.ts
@@ -1,3 +1,5 @@
+import { AuthenticationType } from "./authentication-type";
+
 interface ClientData {
   AnimatedImageData: Array<AnimatedImageData>;
   ArmSize: string;
@@ -78,6 +80,7 @@ interface LoginTokenData {
   clientData: ClientData;
   identityData: IdentityData;
   publicKey: string;
+  authenticationType: AuthenticationType
 }
 
 export type { LoginTokenData, IdentityData, ClientData };