diff --git a/Game/scripts/server_boot.gd b/Game/scripts/server_boot.gd
index 36881e20..af9aa66f 100644
--- a/Game/scripts/server_boot.gd
+++ b/Game/scripts/server_boot.gd
@@ -51,6 +51,15 @@ func _ready() -> void:
 	ServerLog.configure(String(config.get_value("log-level")))
 	var port := int(config.get_value("port"))
 	var max_clients := int(config.get_value("max-clients"))
+	var allocated_mode := bool(config.get_value("allocated-mode"))
+	var assigned_transport := String(config.get_value("transport"))
+	# Hosted SDR is not wired into the Godot transport layer yet. Refuse the
+	# allocated launch rather than silently opening an ENet endpoint that does
+	# not match the signed assignment's transport contract.
+	if allocated_mode and assigned_transport != NetworkManager.TRANSPORT_ENET:
+		printerr("cosmic-clash-server: allocated transport '%s' is not supported by this build" % assigned_transport)
+		get_tree().quit(1)
+		return
 
 	NetworkManager.client_connected.connect(_on_client_connected)
 	NetworkManager.client_disconnected.connect(_on_client_disconnected)
@@ -66,8 +75,13 @@ func _ready() -> void:
 	ServerLog.info("server_started", {
 		"port": port, "max_clients": max_clients, "log_level": ServerLog.level_name(),
 		"min_players": int(config.get_value("min-players")),
-		"max_matches": int(config.get_value("max-matches")),
+		"max_matches": 1 if allocated_mode else int(config.get_value("max-matches")),
 		"arena_rotation": String(config.get_value("arena-rotation")),
+		"allocated_mode": allocated_mode,
+		"match_id": String(config.get_value("match-id")) if allocated_mode else "",
+		"server_id": String(config.get_value("server-id")) if allocated_mode else "",
+		"region": String(config.get_value("region")) if allocated_mode else "",
+		"transport": assigned_transport if allocated_mode else NetworkManager.TRANSPORT_ENET,
 	})
 	_last_physics_frame = Engine.get_physics_frames()
 
@@ -81,7 +95,7 @@ func _install_match_loop() -> void:
 	loop.name = "ServerMatchLoop"
 	loop.min_players = int(config.get_value("min-players"))
 	loop.start_countdown_seconds = float(config.get_value("start-countdown"))
-	loop.max_matches = int(config.get_value("max-matches"))
+	loop.max_matches = 1 if bool(config.get_value("allocated-mode")) else int(config.get_value("max-matches"))
 	loop.rotation_mode = String(config.get_value("arena-rotation"))
 	get_tree().root.add_child.call_deferred(loop)
 
@@ -118,4 +132,3 @@ func _on_player_joined(peer_id: int, player_name: String) -> void:
 
 func _on_player_left(peer_id: int) -> void:
 	ServerLog.info("player_left", {"peer_id": peer_id, "roster": MatchNet.roster.size()})
-
diff --git a/multiplayer-todo.md b/multiplayer-todo.md
index 2f891ba3..1e0a6afe 100644
--- a/multiplayer-todo.md
+++ b/multiplayer-todo.md
@@ -1173,7 +1173,7 @@ the local/CI/community transport, not a silent production fallback.
 | 8.3 `[D:8.1]` | **DONE.** Publish versioned OpenAPI + WebSocket contracts for Steam login/session, profile/rating, queue create/heartbeat/cancel/resume, proposal accept/decline, assignment/status, server registration/roster/result/shutdown | [`server/contracts/v1/`](server/contracts/v1/) contains machine-readable REST/events contracts and dependency-free structural tests; REST resync is specified by the contract; `server/api/service.go` also exposes the documented `/api/v1` route names (including server-assigned idempotent queue ticket IDs and DELETE cancellation) alongside the existing client `/v1` routes, covered by `TestDocumentedContractRoutesAdaptToServiceAPI` |
 | 8.4 `[D:8.3]` | **DONE.** Define opaque IDs, legal queue/match state transitions, revisions and idempotency keys | [`server/contracts/v1/state-transitions.json`](server/contracts/v1/state-transitions.json) locks terminal states, legal edges, stale-revision handling and same-key replay/conflict behavior; contract tests cover the invariants |
 | 8.5 `[D:8.4]` | **IN PROGRESS.** Initial PostgreSQL migration now defines durable idempotency keys, queue ownership/active-participation fencing, identities, sessions/revocations, ranked seasons, ratings/events, matches/participants, penalties, results, audits and outbox | `server/migrations/0001_initial.sql` and static checks cover the durable tables, uniqueness/check constraints and Redis-as-cache boundary; live PostgreSQL up/rollback/forward migration, serializable adapters and cache-loss repair remain |
-| 8.6 `[D:8.3,8.4]` | **IN PROGRESS.** Add allocated-mode `ServerConfig` compatibility fields as opt-in defaults | `ServerConfig` now validates allocation mode, match/server IDs, playlist version, client build, future assignment expiry, image digest, transport and EU/NA region; signed-authorisation admission and full manifest/runtime tests remain |
+| 8.6 `[D:8.3,8.4]` | **IN PROGRESS.** Add allocated-mode `ServerConfig` compatibility fields as opt-in defaults | `ServerConfig` now validates allocation mode, match/server IDs, playlist version, client build, future assignment expiry, image digest, transport and EU/NA region; `server_boot.gd` fails closed for the not-yet-wired Steam SDR transport, constrains allocated processes to one match, and emits allocation identity/transport in `server_started`; signed-authorisation admission, dynamic endpoint wiring and full manifest/runtime tests remain |
 
 #### 8B — Authentication and secure control plane