diff --git a/app/src/androidMain/kotlin/com/aerotoss/transfer/AndroidTransferManager.kt b/app/src/androidMain/kotlin/com/aerotoss/transfer/AndroidTransferManager.kt
index 125deda..68425b3 100644
--- a/app/src/androidMain/kotlin/com/aerotoss/transfer/AndroidTransferManager.kt
+++ b/app/src/androidMain/kotlin/com/aerotoss/transfer/AndroidTransferManager.kt
@@ -37,6 +37,7 @@ class AndroidFileTransferManager(private val context: Context) : TransferManager
     private var serverThread: Thread? = null
     private val scope = CoroutineScope(Dispatchers.IO + SupervisorJob())
     private val activeJobs = ConcurrentHashMap<String, Job>()
+    private val activeSockets = ConcurrentHashMap<String, Socket>()
     private val running = AtomicBoolean(false)
     private val connectionLimiter = Semaphore(10)
 
@@ -220,6 +221,7 @@ class AndroidFileTransferManager(private val context: Context) : TransferManager
         val job = scope.launch {
             try {
                 val socket = Socket(targetHost, targetPort)
+                activeSockets[requestId] = socket
                 socket.use { sock ->
                     sock.soTimeout = 30_000
                     val input = DataInputStream(sock.getInputStream())
@@ -300,6 +302,8 @@ class AndroidFileTransferManager(private val context: Context) : TransferManager
     override fun cancelTransfer(requestId: String) {
         activeJobs[requestId]?.cancel()
         activeJobs.remove(requestId)
+        activeSockets[requestId]?.let { try { it.close() } catch (_: Exception) {} }
+        activeSockets.remove(requestId)
         updateOutgoingById(requestId, _outgoingTransfers.value.find { it.id == requestId }?.copy(
             state = TransferState.CANCELLED
         ) ?: return)
diff --git a/app/src/desktopMain/kotlin/com/aerotoss/transfer/DesktopTransferManager.kt b/app/src/desktopMain/kotlin/com/aerotoss/transfer/DesktopTransferManager.kt
index 73faf3e..e6c30d7 100644
--- a/app/src/desktopMain/kotlin/com/aerotoss/transfer/DesktopTransferManager.kt
+++ b/app/src/desktopMain/kotlin/com/aerotoss/transfer/DesktopTransferManager.kt
@@ -31,6 +31,7 @@ class DesktopFileTransferManager : TransferManager {
     }
 
     private val transferStates = ConcurrentHashMap<String, MutableStateFlow<TransferProgress>>()
+    private val activeSockets = ConcurrentHashMap<String, Socket>()
 
     private var serverSocket: ServerSocket? = null
     private var serverThread: Thread? = null
@@ -218,6 +219,7 @@ class DesktopFileTransferManager : TransferManager {
         val job = scope.launch {
             try {
                 val socket = Socket(targetHost, targetPort)
+                activeSockets[requestId] = socket
                 socket.use { sock ->
                     sock.soTimeout = 30_000
                     val input = DataInputStream(sock.getInputStream())
@@ -292,6 +294,8 @@ class DesktopFileTransferManager : TransferManager {
     override fun cancelTransfer(requestId: String) {
         activeJobs[requestId]?.cancel()
         activeJobs.remove(requestId)
+        activeSockets[requestId]?.let { try { it.close() } catch (_: Exception) {} }
+        activeSockets.remove(requestId)
         transferStates[requestId]?.let { flow ->
             flow.value = flow.value.copy(state = TransferState.CANCELLED)
             updateOutgoing(flow.value)