diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/network/KeyTransferInteractor.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/network/KeyTransferInteractor.java
index 6efe34572..b550d471e 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/network/KeyTransferInteractor.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/network/KeyTransferInteractor.java
@@ -78,7 +78,8 @@ public class KeyTransferInteractor {
     private static final int CONNECTION_RECEIVE_OK = 4;
     private static final int CONNECTION_LOST = 5;
     private static final int CONNECTION_ERROR_CONNECT = 6;
-    private static final int CONNECTION_ERROR_LISTEN = 7;
+    private static final int CONNECTION_ERROR_WHILE_CONNECTED = 7;
+    private static final int CONNECTION_ERROR_LISTEN = 8;
 
     private static final String QRCODE_URI_FORMAT = "PGP+TRANSFER://%s@%s:%s";
     private static final int TIMEOUT_RECEIVING = 2000;
@@ -174,7 +175,8 @@ public class KeyTransferInteractor {
                     Log.d(Constants.TAG, "ssl handshake error!", e);
                     invokeListener(CONNECTION_ERROR_CONNECT, null);
                 } catch (IOException e) {
-                    Log.e(Constants.TAG, "error!", e);
+                    Log.e(Constants.TAG, "communication error!", e);
+                    invokeListener(CONNECTION_ERROR_WHILE_CONNECTED, e.getLocalizedMessage());
                 }
             } finally {
                 closeQuietly(socket);
@@ -338,6 +340,9 @@ public class KeyTransferInteractor {
                         case CONNECTION_LOST:
                             callback.onConnectionLost();
                             break;
+                        case CONNECTION_ERROR_WHILE_CONNECTED:
+                            callback.onConnectionError(arg);
+                            break;
                         case CONNECTION_ERROR_CONNECT:
                             callback.onConnectionErrorConnect();
                             break;
@@ -392,6 +397,7 @@ public class KeyTransferInteractor {
 
         void onConnectionErrorConnect();
         void onConnectionErrorListen();
+        void onConnectionError(String arg);
     }
 
     /**
@@ -413,9 +419,11 @@ public class KeyTransferInteractor {
                     }
                     String sAddr = addr.getHostAddress();
                     boolean isIPv4 = sAddr.indexOf(':') < 0;
-                    if (isIPv4 && useIPv4) {
+                    if (useIPv4) {
+                        if (isIPv4) {
                             return sAddr;
-                    } else if (!isIPv4) {
+                        }
+                    } else {
                         int delimIndex = sAddr.indexOf('%'); // drop ip6 zone suffix
                         if (delimIndex >= 0) {
                             sAddr = sAddr.substring(0, delimIndex);
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/presenter/TransferPresenter.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/presenter/TransferPresenter.java
index b29dc7425..da5ba484a 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/presenter/TransferPresenter.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/presenter/TransferPresenter.java
@@ -276,6 +276,16 @@ public class TransferPresenter implements KeyTransferCallback, LoaderCallbacks<L
         view.showErrorListenFailed();
     }
 
+    @Override
+    public void onConnectionError(String errorMessage) {
+        view.showErrorConnectionError(errorMessage);
+
+        connectionClear();
+        if (wasConnected) {
+            view.showViewDisconnected();
+            secretKeyAdapter.setAllDisabled(true);
+        }
+    }
 
     private void connectionStartConnect(String qrCodeContent) {
         connectionClear();
@@ -367,6 +377,7 @@ public class TransferPresenter implements KeyTransferCallback, LoaderCallbacks<L
         void showErrorBadKey();
         void showErrorConnectionFailed();
         void showErrorListenFailed();
+        void showErrorConnectionError(String errorMessage);
         void showResultNotification(ImportKeyResult result);
 
         void setSecretKeyAdapter(Adapter adapter);
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/view/TransferFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/view/TransferFragment.java
index 46a3bd7c1..5668b4f0e 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/view/TransferFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/view/TransferFragment.java
@@ -255,6 +255,16 @@ public class TransferFragment extends Fragment implements TransferMvpView {
         Notify.create(getActivity(), R.string.transfer_error_listen, Style.ERROR).show();
     }
 
+    @Override
+    public void showErrorConnectionError(String errorMessage) {
+        if (errorMessage != null) {
+            String text = getString(R.string.transfer_error_generic_msg, errorMessage);
+            Notify.create(getActivity(), text, Style.ERROR).show();
+        } else {
+            Notify.create(getActivity(), R.string.transfer_error_generic, Style.ERROR).show();
+        }
+    }
+
     @Override
     public void showResultNotification(ImportKeyResult result) {
         result.createNotify(getActivity()).show();
diff --git a/OpenKeychain/src/main/res/values/strings.xml b/OpenKeychain/src/main/res/values/strings.xml
index bc951fd9d..8c33c67dc 100644
--- a/OpenKeychain/src/main/res/values/strings.xml
+++ b/OpenKeychain/src/main/res/values/strings.xml
@@ -1901,6 +1901,8 @@
     <string name="transfer_error_read_incoming">"Failed reading incoming key!"</string>
     <string name="transfer_error_connect">"Connection failed!"</string>
     <string name="transfer_error_listen">"Error waiting for connection!"</string>
+    <string name="transfer_error_generic">"Unknown communication error!"</string>
+    <string name="transfer_error_generic_msg">"Communication error: %s"</string>
     <string name="transfer_not_available">"Sorry, this feature can only be used on Android 5 or newer :("</string>
     <string name="transfer_list_empty">No keys on this device that could be sent.  Waiting for incoming keys…</string>