diff --git a/NearbyShare/NearbyConnection.swift b/NearbyShare/NearbyConnection.swift
index 56222e3..7da9617 100644
--- a/NearbyShare/NearbyConnection.swift
+++ b/NearbyShare/NearbyConnection.swift
@@ -52,6 +52,7 @@ class NearbyConnection {
     
     func start() {
         connection.stateUpdateHandler = { state in
+            
             if !self.connectionClosed {
                 if case .ready = state {
                     self.connectionReady()
@@ -91,6 +92,10 @@ class NearbyConnection {
                 }
             }
             
+            if err == .posix(.ENETDOWN) {
+                self.lastError = NearbyError.protocolError("Error.NetworkDown")
+            }
+            
             self.handleConnectionClosure()
         }
     }
@@ -133,6 +138,7 @@ class NearbyConnection {
             }
             if isComplete {
                 log("Connection closed by peer during receiveFrameAsync")
+                self.lastError = NearbyError.protocolError("Error.ClosedByPeer".localized())
                 self.handleConnectionClosure()
                 return
             }
@@ -162,6 +168,7 @@ class NearbyConnection {
             }
             if isComplete {
                 log("Connection closed by peer during receiveFrameAsync")
+                self.lastError = NearbyError.protocolError("Error.ClosedByPeer".localized())
                 self.handleConnectionClosure()
                 return
             }
diff --git a/QuickDrop.xcodeproj/project.pbxproj b/QuickDrop.xcodeproj/project.pbxproj
index 3a0d53d..1560cfa 100644
--- a/QuickDrop.xcodeproj/project.pbxproj
+++ b/QuickDrop.xcodeproj/project.pbxproj
@@ -53,6 +53,7 @@
 		EB96ED8D2D7F7EA3004B3FF1 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 69DA9A1329E0BF5200A442DA /* Assets.xcassets */; };
 		EB96ED8F2D7F8105004B3FF1 /* Localized.swift in Sources */ = {isa = PBXBuildFile; fileRef = EB96ED8E2D7F8103004B3FF1 /* Localized.swift */; };
 		EB96ED902D7F8114004B3FF1 /* Localized.swift in Sources */ = {isa = PBXBuildFile; fileRef = EB96ED8E2D7F8103004B3FF1 /* Localized.swift */; };
+		EBC05C592E32C22200EECC18 /* Localized.swift in Sources */ = {isa = PBXBuildFile; fileRef = EB96ED8E2D7F8103004B3FF1 /* Localized.swift */; };
 		EBCC27F92D80C9F90079C478 /* Zip.swift in Sources */ = {isa = PBXBuildFile; fileRef = EBCC27F82D80C9F70079C478 /* Zip.swift */; };
 		EBD2A2172D2860C100BCB8E2 /* WelcomeScreen.swift in Sources */ = {isa = PBXBuildFile; fileRef = EBD2A2162D2860BE00BCB8E2 /* WelcomeScreen.swift */; };
 /* End PBXBuildFile section */
@@ -587,6 +588,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				69DCF48D2AB70E8C00CBE2CC /* offline_wire_formats.pb.swift in Sources */,
+				EBC05C592E32C22200EECC18 /* Localized.swift in Sources */,
 				EB2F9BFB2DA04B69004010A2 /* Helpers.swift in Sources */,
 				69DCF48F2AB70E8C00CBE2CC /* securemessage.pb.swift in Sources */,
 				69DCF4912AB70E9700CBE2CC /* NearbyConnection.swift in Sources */,
diff --git a/QuickDrop/AppDelegate.swift b/QuickDrop/AppDelegate.swift
index a17e8d8..228443c 100644
--- a/QuickDrop/AppDelegate.swift
+++ b/QuickDrop/AppDelegate.swift
@@ -476,8 +476,8 @@ class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCenterDele
                     description = NSLocalizedString("Error.Protocol", value: "Communication error", comment: "") + "(\(errorMessage))"
                 case .ukey2:
                     description = NSLocalizedString("Error.Crypto", value: "Encryption error", comment: "") + "(\(ne.localizedDescription))"
-                case .canceled(reason: _):
-                    break // can't happen for incoming transfers
+                case .canceled(reason: let reason):
+                    description = "Error.Protocol".localized() + " (\(reason))"
                 }
             } else {
                 description = error.localizedDescription
diff --git a/QuickDrop/Base.lproj/Localizable.strings b/QuickDrop/Base.lproj/Localizable.strings
index 9a07b2d..3cfda3d 100644
--- a/QuickDrop/Base.lproj/Localizable.strings
+++ b/QuickDrop/Base.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Communication error";
 
+"Error.ClosedByPeer" = "The connection was closed. If this happens repeatedly, please restart your phone.";
+
+"Error.NetworkDown" = "The Wi-Fi connection was interrupted. Please check your Wi-Fi connection and try again.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d files";
 
diff --git a/QuickDrop/ar.lproj/Localizable.strings b/QuickDrop/ar.lproj/Localizable.strings
index 48f1729..065ff8b 100644
--- a/QuickDrop/ar.lproj/Localizable.strings
+++ b/QuickDrop/ar.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "خطأ في الاتصال";
 
+"Error.ClosedByPeer" = "تم إغلاق الاتصال. إذا تكرر هذا الأمر، يرجى إعادة تشغيل هاتفك.";
+
+"Error.NetworkDown" = "تم قطع اتصال Wi‑Fi. يرجى التحقق من اتصال Wi‑Fi الخاص بك والمحاولة مرة أخرى.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d ملفات";
 
diff --git a/QuickDrop/de.lproj/Localizable.strings b/QuickDrop/de.lproj/Localizable.strings
index 3ff64fd..687476c 100644
--- a/QuickDrop/de.lproj/Localizable.strings
+++ b/QuickDrop/de.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Fehler bei der Datenübertragung";
 
+"Error.ClosedByPeer" = "Die Verbindung wurde geschlossen. Wenn das wiederholt passiert, starte bitte dein Handy neu.";
+
+"Error.NetworkDown" = "Die WLAN‑Verbindung wurde unterbrochen. Bitte überprüfe deine WLAN‑Verbindung und versuche es erneut.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d Dateien";
 
diff --git a/QuickDrop/es.lproj/Localizable.strings b/QuickDrop/es.lproj/Localizable.strings
index b55f8bc..802cb5b 100644
--- a/QuickDrop/es.lproj/Localizable.strings
+++ b/QuickDrop/es.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Error de comunicación";
 
+"Error.ClosedByPeer" = "La conexión se cerró. Si esto ocurre repetidamente, reinicia tu teléfono.";
+
+"Error.NetworkDown" = "La conexión Wi‑Fi se interrumpió. Por favor, verifica tu conexión Wi‑Fi e inténtalo de nuevo.";
+
 /* No comment provided by engineer. */
 //"NFiles" = "%d archivos";
 
diff --git a/QuickDrop/fr.lproj/Localizable.strings b/QuickDrop/fr.lproj/Localizable.strings
index d1f6208..10dcd94 100644
--- a/QuickDrop/fr.lproj/Localizable.strings
+++ b/QuickDrop/fr.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Erreur de communication";
 
+"Error.ClosedByPeer" = "La connexion a été fermée. Si cela se produit à plusieurs reprises, redémarrez votre téléphone.";
+
+"Error.NetworkDown" = "La connexion Wi‑Fi a été interrompue. Veuillez vérifier votre connexion Wi‑Fi et réessayer.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d fichiers";
 
diff --git a/QuickDrop/hu.lproj/Localizable.strings b/QuickDrop/hu.lproj/Localizable.strings
index 8b484c2..7e4b6bf 100644
--- a/QuickDrop/hu.lproj/Localizable.strings
+++ b/QuickDrop/hu.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Kommunikációs hiba";
 
+"Error.ClosedByPeer" = "A kapcsolat megszakadt. Ha ez többször előfordul, indítsd újra a telefonodat.";
+
+"Error.NetworkDown" = "Megszakadt a Wi‑Fi kapcsolat. Kérlek, ellenőrizd a Wi‑Fi kapcsolatodat, majd próbáld újra.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d fájl";
 
diff --git a/QuickDrop/it.lproj/Localizable.strings b/QuickDrop/it.lproj/Localizable.strings
index 05b6f6f..91cc21e 100644
--- a/QuickDrop/it.lproj/Localizable.strings
+++ b/QuickDrop/it.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Errore di comunicazione";
 
+"Error.ClosedByPeer" = "La connessione è stata chiusa. Se ciò accade ripetutamente, riavvia il telefono.";
+
+"Error.NetworkDown" = "La connessione Wi‑Fi è stata interrotta. Controlla la tua connessione Wi‑Fi e riprova.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d files";
 
diff --git a/QuickDrop/ja.lproj/Localizable.strings b/QuickDrop/ja.lproj/Localizable.strings
index f6f1bea..8ee7015 100644
--- a/QuickDrop/ja.lproj/Localizable.strings
+++ b/QuickDrop/ja.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "通信エラー";
 
+"Error.ClosedByPeer" = "接続が切断されました。これが繰り返し発生する場合は、スマートフォンを再起動してください。";
+
+"Error.NetworkDown" = "Wi‑Fi 接続が中断されました。Wi‑Fi 接続を確認してから、もう一度お試しください。";
+
 /* No comment provided by engineer. */
 "NFiles" = "%dつのファイル";
 
diff --git a/QuickDrop/ko.lproj/Localizable.strings b/QuickDrop/ko.lproj/Localizable.strings
index 5cfa986..aa25263 100644
--- a/QuickDrop/ko.lproj/Localizable.strings
+++ b/QuickDrop/ko.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "통신 오류";
 
+"Error.ClosedByPeer" = "연결이 종료되었습니다. 이러한 문제가 반복되면 휴대전화를 재시작하세요.";
+
+"Error.NetworkDown" = "Wi‑Fi 연결이 끊어졌습니다. Wi‑Fi 연결 상태를 확인하고 다시 시도하세요.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d개의 파일";
 
diff --git a/QuickDrop/nl.lproj/Localizable.strings b/QuickDrop/nl.lproj/Localizable.strings
index b953608..96f15c6 100644
--- a/QuickDrop/nl.lproj/Localizable.strings
+++ b/QuickDrop/nl.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Communicatiefout";
 
+"Error.ClosedByPeer" = "De verbinding is verbroken. Als dit herhaaldelijk gebeurt, start dan je telefoon opnieuw op.";
+
+"Error.NetworkDown" = "De Wi‑Fi‑verbinding is onderbroken. Controleer je Wi‑Fi‑verbinding en probeer het opnieuw.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d bestanden";
 
diff --git a/QuickDrop/pt-BR.lproj/Localizable.strings b/QuickDrop/pt-BR.lproj/Localizable.strings
index ad9defb..e208b5b 100644
--- a/QuickDrop/pt-BR.lproj/Localizable.strings
+++ b/QuickDrop/pt-BR.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Erro de comunicação";
 
+"Error.ClosedByPeer" = "A conexão foi encerrada. Se isso acontecer repetidamente, reinicie o seu celular.";
+
+"Error.NetworkDown" = "A ligação Wi‑Fi foi interrompida. Verifica a tua ligação Wi‑Fi e tenta novamente.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d arquivos";
 
diff --git a/QuickDrop/pt-PT.lproj/Localizable.strings b/QuickDrop/pt-PT.lproj/Localizable.strings
index c578aec..5cc596b 100644
--- a/QuickDrop/pt-PT.lproj/Localizable.strings
+++ b/QuickDrop/pt-PT.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Erro de comunicação";
 
+"Error.ClosedByPeer" = "A ligação foi encerrada. Se isto acontecer repetidamente, reinicia o teu telemóvel.";
+
+"Error.NetworkDown" = "A ligação Wi‑Fi foi interrompida. Verifica a tua ligação Wi‑Fi e tenta novamente.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d ficheiros";
 
diff --git a/QuickDrop/ro.lproj/Localizable.strings b/QuickDrop/ro.lproj/Localizable.strings
index d2c7ab0..1a10dfb 100644
--- a/QuickDrop/ro.lproj/Localizable.strings
+++ b/QuickDrop/ro.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Eroare de comunicare";
 
+"Error.ClosedByPeer" = "Conexiunea a fost închisă. Dacă se întâmplă în mod repetat, repornește telefonul.";
+
+"Error.NetworkDown" = "Conexiunea Wi‑Fi a fost întreruptă. Verifică conexiunea Wi‑Fi și încearcă din nou.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d fișiere";
 
diff --git a/QuickDrop/ru.lproj/Localizable.strings b/QuickDrop/ru.lproj/Localizable.strings
index 7bbe7ee..1b9155d 100644
--- a/QuickDrop/ru.lproj/Localizable.strings
+++ b/QuickDrop/ru.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Ошибка протокола";
 
+"Error.ClosedByPeer" = "Соединение было закрыто. Если это происходит неоднократно, перезагрузите телефон.";
+
+"Error.NetworkDown" = "Соединение по Wi‑Fi было прервано. Пожалуйста, проверьте соединение Wi‑Fi и попробуйте снова.";
+
 /* No comment provided by engineer. */
 /*"NFiles" = "%d файлов";*/
 
diff --git a/QuickDrop/th.lproj/Localizable.strings b/QuickDrop/th.lproj/Localizable.strings
index e4132ff..8b22a2a 100644
--- a/QuickDrop/th.lproj/Localizable.strings
+++ b/QuickDrop/th.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "การสื่อสารผิดพลาด";
 
+"Error.ClosedByPeer" = "การเชื่อมต่อถูกปิด หากเกิดขึ้นซ้ำหลายครั้ง โปรดรีสตาร์ทโทรศัพท์ของคุณ";
+
+"Error.NetworkDown" = "การเชื่อมต่อ Wi‑Fi ถูกขัดจังหวะ โปรดตรวจสอบการเชื่อมต่อ Wi‑Fi ของคุณแล้วลองอีกครั้ง";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d ไฟล์";
 
diff --git a/QuickDrop/uk.lproj/Localizable.strings b/QuickDrop/uk.lproj/Localizable.strings
index 13627e6..0f2b20c 100644
--- a/QuickDrop/uk.lproj/Localizable.strings
+++ b/QuickDrop/uk.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "Помилка протоколу";
 
+"Error.ClosedByPeer" = "З'єднання було закрито. Якщо це трапляється постійно, перезавантажте телефон.";
+
+"Error.NetworkDown" = "З’єднання Wi‑Fi було перервано. Будь ласка, перевірте своє Wi‑Fi з’єднання та спробуйте ще раз.";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d files";
 
diff --git a/QuickDrop/zh-Hans.lproj/Localizable.strings b/QuickDrop/zh-Hans.lproj/Localizable.strings
index 391ca32..9931e77 100644
--- a/QuickDrop/zh-Hans.lproj/Localizable.strings
+++ b/QuickDrop/zh-Hans.lproj/Localizable.strings
@@ -24,6 +24,10 @@
 /* No comment provided by engineer. */
 "Error.Protocol" = "通信出错";
 
+"Error.ClosedByPeer" = "连接已关闭。如果这种情况反复发生，请重启手机。";
+
+"Error.NetworkDown" = "Wi‑Fi 连接中断。请检查您的 Wi‑Fi 连接并重试。";
+
 /* No comment provided by engineer. */
 "NFiles" = "%d files";