diff --git a/docbook/release-notes.adoc b/docbook/release-notes.adoc
index 491a800779..ca5b6c5a8f 100644
--- a/docbook/release-notes.adoc
+++ b/docbook/release-notes.adoc
@@ -78,6 +78,8 @@ They previously shipped with Npcap 1.55.
 
 * It is possible to set extcap passwords on cli for tshark and other cli tools.
 
+* Extcap configuration dialog now supports and remembers empty strings. There are new buttons to reset a value back to default value.
+
 === Removed Features and Support
 
 * CMake: The options starting with DISABLE_something were renamed ENABLE_something for consistency.
diff --git a/ui/qt/extcap_argument.cpp b/ui/qt/extcap_argument.cpp
index aaf0059ec1..aa67b69dcd 100644
--- a/ui/qt/extcap_argument.cpp
+++ b/ui/qt/extcap_argument.cpp
@@ -46,19 +46,16 @@
 #include <ui/qt/extcap_options_dialog.h>
 
 ExtArgTimestamp::ExtArgTimestamp(extcap_arg * argument, QObject * parent) :
-    ExtcapArgument(argument, parent) {}
+    ExtcapArgument(argument, parent), tsBox(0) {}
 
 QWidget * ExtArgTimestamp::createEditor(QWidget * parent)
 {
-    QDateTimeEdit * tsBox;
     QString text = defaultValue();
 
-    if (_argument->pref_valptr && *_argument->pref_valptr)
+    if (_argument->pref_valptr && strlen(*_argument->pref_valptr))
     {
         QString storeValue(*_argument->pref_valptr);
-
-        if (storeValue.length() > 0 && storeValue.compare(text) != 0)
-            text = storeValue.trimmed();
+        text = storeValue.trimmed();
     }
 
 #if QT_VERSION >= QT_VERSION_CHECK(5, 8, 0)
@@ -118,16 +115,30 @@ QString ExtArgTimestamp::prefValue()
     return value();
 }
 
+bool ExtArgTimestamp::isSetDefaultValueSupported()
+{
+    return TRUE;
+}
+
+void ExtArgTimestamp::setDefaultValue()
+{
+    QDateTime t;
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 8, 0)
+    t = QDateTime::fromSecsSinceEpoch(defaultValue().toInt());
+#else
+    t = QDateTime::fromTime_t(defaultValue().toInt());
+#endif
+    tsBox->setDateTime(t);
+}
+
+
+
 ExtArgSelector::ExtArgSelector(extcap_arg * argument, QObject * parent) :
         ExtcapArgument(argument, parent), boxSelection(0) {}
 
 QWidget * ExtArgSelector::createEditor(QWidget * parent)
 {
-    int counter = 0;
-    int selected = -1;
-    const char *prefval = (_argument->pref_valptr && strlen(*_argument->pref_valptr)) ? *_argument->pref_valptr : NULL;
-    QString stored(prefval ? prefval : "");
-
     QWidget * editor = new QWidget(parent);
     QHBoxLayout * layout = new QHBoxLayout();
     QMargins margins = layout->contentsMargins();
@@ -144,20 +155,12 @@ QWidget * ExtArgSelector::createEditor(QWidget * parent)
         while (iter != values.constEnd())
         {
             boxSelection->addItem((*iter).value(), (*iter).call());
-
-            if (!prefval && (*iter).isDefault())
-                selected = counter;
-            else if (prefval && stored.compare((*iter).call()) == 0)
-                selected = counter;
-
-            counter++;
             ++iter;
         }
-
-        if (selected > -1 && selected < boxSelection->count())
-            boxSelection->setCurrentIndex(selected);
     }
 
+    setDefaultValue();
+
     if (reload())
     {
         QString btnText(tr("Reload data"));
@@ -185,7 +188,7 @@ void ExtArgSelector::onReloadTriggered()
     int selected = -1;
 
     QString call = boxSelection->currentData().toString();
-    const char *prefval = _argument->pref_valptr ? *_argument->pref_valptr : NULL;
+    const char *prefval = (_argument->pref_valptr && strlen(*_argument->pref_valptr)) ? *_argument->pref_valptr : NULL;
     QString stored(prefval ? prefval : "");
     if (call != stored)
         stored = call;
@@ -241,14 +244,48 @@ QString ExtArgSelector::value()
     return data.toString();
 }
 
+bool ExtArgSelector::isSetDefaultValueSupported()
+{
+    return TRUE;
+}
+
+void ExtArgSelector::setDefaultValue()
+{
+    int counter = 0;
+    int selected = -1;
+
+    const char *prefval = (_argument->pref_valptr && strlen(*_argument->pref_valptr)) ? *_argument->pref_valptr : NULL;
+    QString stored(prefval ? prefval : "");
+
+    if (values.length() > 0)
+    {
+        ExtcapValueList::const_iterator iter = values.constBegin();
+
+        while (iter != values.constEnd())
+        {
+            if (!prefval && (*iter).isDefault())
+                selected = counter;
+            else if (prefval && stored.compare((*iter).call()) == 0)
+                selected = counter;
+
+            counter++;
+            ++iter;
+        }
+
+        if (selected > -1 && selected < boxSelection->count())
+            boxSelection->setCurrentIndex(selected);
+    }
+
+}
+
+
+
 ExtArgRadio::ExtArgRadio(extcap_arg * argument, QObject * parent) :
         ExtcapArgument(argument, parent), selectorGroup(0), callStrings(0) {}
 
 QWidget * ExtArgRadio::createEditor(QWidget * parent)
 {
-
     int count = 0;
-    bool anyChecked = false;
 
     selectorGroup = new QButtonGroup(parent);
     QWidget * radioButtons = new QWidget;
@@ -270,12 +307,6 @@ QWidget * ExtArgRadio::createEditor(QWidget * parent)
             QString callString = (*iter).call();
             callStrings->append(callString);
 
-            if ((*iter).isDefault())
-            {
-                radio->setChecked(true);
-                anyChecked = true;
-            }
-
             connect(radio, SIGNAL(clicked(bool)), SLOT(onBoolChanged(bool)));
             selectorGroup->addButton(radio, count);
 
@@ -286,9 +317,7 @@ QWidget * ExtArgRadio::createEditor(QWidget * parent)
         }
     }
 
-    /* No default was provided, and not saved value exists */
-    if (anyChecked == false && count > 0)
-        ((QRadioButton*)(selectorGroup->button(0)))->setChecked(true);
+    setDefaultValue();
 
     radioButtons->setLayout(vrLayout);
 
@@ -333,6 +362,39 @@ bool ExtArgRadio::isValid()
     return valid;
 }
 
+bool ExtArgRadio::isSetDefaultValueSupported()
+{
+    return TRUE;
+}
+
+void ExtArgRadio::setDefaultValue()
+{
+    int count = 0;
+    bool anyChecked = false;
+
+    if (values.length() > 0  )
+    {
+        ExtcapValueList::const_iterator iter = values.constBegin();
+
+        while (iter != values.constEnd())
+        {
+            if ((*iter).isDefault())
+            {
+                selectorGroup->button(count)->setChecked(true);
+                anyChecked = true;
+            }
+            count++;
+            ++iter;
+        }
+    }
+
+    /* No default was provided, and not saved value exists */
+    if (anyChecked == false && count > 0)
+        ((QRadioButton*)(selectorGroup->button(0)))->setChecked(true);
+}
+
+
+
 ExtArgBool::ExtArgBool(extcap_arg * argument, QObject * parent) :
         ExtcapArgument(argument, parent), boolBox(0) {}
 
@@ -349,7 +411,7 @@ QWidget * ExtArgBool::createEditor(QWidget * parent)
     if (_argument->tooltip != NULL)
         boolBox->setToolTip(QString().fromUtf8(_argument->tooltip));
 
-    const char *prefval = _argument->pref_valptr ? *_argument->pref_valptr : NULL;
+    const char *prefval = (_argument->pref_valptr && strlen(*_argument->pref_valptr)) ? *_argument->pref_valptr : NULL;
     if (prefval)
     {
         QRegularExpression regexp(EXTCAP_BOOLEAN_REGEX);
@@ -416,6 +478,18 @@ QString ExtArgBool::defaultValue()
     return defaultBool() ? QString("true") : QString("false");
 }
 
+bool ExtArgBool::isSetDefaultValueSupported()
+{
+    return TRUE;
+}
+
+void ExtArgBool::setDefaultValue()
+{
+    boolBox->setCheckState(defaultBool() ? Qt::Checked : Qt::Unchecked);
+}
+
+
+
 ExtArgText::ExtArgText(extcap_arg * argument, QObject * parent) :
     ExtcapArgument(argument, parent), textBox(0)
 {
@@ -425,12 +499,11 @@ QWidget * ExtArgText::createEditor(QWidget * parent)
 {
     QString text = defaultValue();
 
-    if (_argument->pref_valptr && *_argument->pref_valptr)
+    /* Prefs can contain empty string. We accept it. */
+    if (_argument->pref_valptr && (*_argument->pref_valptr))
     {
         QString storeValue(*_argument->pref_valptr);
-
-        if (storeValue.length() > 0 && storeValue.compare(text) != 0)
-            text = storeValue.trimmed();
+        text = storeValue.trimmed();
     }
 
     textBox = new QLineEdit(text, parent);
@@ -512,6 +585,18 @@ bool ExtArgText::isValid()
     return valid;
 }
 
+bool ExtArgText::isSetDefaultValueSupported()
+{
+    return TRUE;
+}
+
+void ExtArgText::setDefaultValue()
+{
+    textBox->setText(defaultValue());
+}
+
+
+
 ExtArgNumber::ExtArgNumber(extcap_arg * argument, QObject * parent) :
         ExtArgText(argument, parent) {}
 
@@ -519,12 +604,10 @@ QWidget * ExtArgNumber::createEditor(QWidget * parent)
 {
     QString text = defaultValue();
 
-    if (_argument->pref_valptr && *_argument->pref_valptr)
+    if (_argument->pref_valptr && strlen(*_argument->pref_valptr))
     {
         QString storeValue(*_argument->pref_valptr);
-
-        if (storeValue.length() > 0 && storeValue.compare(text) != 0)
-            text = storeValue;
+        text = storeValue;
     }
 
     textBox = (QLineEdit *)ExtArgText::createEditor(parent);
@@ -908,3 +991,13 @@ void ExtcapArgument::onBoolChanged(bool)
 {
     emit valueChanged();
 }
+
+bool ExtcapArgument::isSetDefaultValueSupported()
+{
+    return FALSE;
+}
+
+void ExtcapArgument::setDefaultValue()
+{
+}
+
diff --git a/ui/qt/extcap_argument.h b/ui/qt/extcap_argument.h
index 28f2e0f646..63f15c456f 100644
--- a/ui/qt/extcap_argument.h
+++ b/ui/qt/extcap_argument.h
@@ -66,6 +66,7 @@ private:
 };
 
 
+
 class ExtcapArgument: public QObject
 {
     Q_OBJECT
@@ -98,6 +99,10 @@ public:
     virtual int argNr() const;
 
     static ExtcapArgument * create(extcap_arg * argument = Q_NULLPTR, QObject * parent = Q_NULLPTR);
+    virtual bool isSetDefaultValueSupported();
+
+public Q_SLOTS:
+    virtual void setDefaultValue();
 
 Q_SIGNALS:
     void valueChanged();
@@ -125,8 +130,11 @@ private Q_SLOTS:
 
 };
 
+
+
 class ExtArgText : public ExtcapArgument
 {
+    Q_OBJECT
 
 public:
     ExtArgText(extcap_arg * argument, QObject *parent = Q_NULLPTR);
@@ -134,14 +142,22 @@ public:
     virtual QWidget * createEditor(QWidget * parent);
     virtual QString value();
     virtual bool isValid();
+    virtual bool isSetDefaultValueSupported();
+
+public Q_SLOTS:
+    virtual void setDefaultValue();
 
 protected:
 
     QLineEdit * textBox;
 };
 
+
+
 class ExtArgNumber : public ExtArgText
 {
+    Q_OBJECT
+
 public:
     ExtArgNumber(extcap_arg * argument, QObject *parent = Q_NULLPTR);
 
@@ -149,6 +165,8 @@ public:
     virtual QString defaultValue();
 };
 
+
+
 class ExtArgSelector : public ExtcapArgument
 {
     Q_OBJECT
@@ -159,6 +177,10 @@ public:
     virtual QWidget * createEditor(QWidget * parent);
     virtual QString value();
     virtual bool isValid();
+    virtual bool isSetDefaultValueSupported();
+
+public Q_SLOTS:
+    virtual void setDefaultValue();
 
 private:
 
@@ -169,14 +191,22 @@ private Q_SLOTS:
 
 };
 
+
+
 class ExtArgRadio : public ExtcapArgument
 {
+    Q_OBJECT
+
 public:
     ExtArgRadio(extcap_arg * argument, QObject *parent = Q_NULLPTR);
 
     virtual QWidget * createEditor(QWidget * parent);
     virtual QString value();
     virtual bool isValid();
+    virtual bool isSetDefaultValueSupported();
+
+public Q_SLOTS:
+    virtual void setDefaultValue();
 
 private:
 
@@ -184,8 +214,12 @@ private:
     QList<QString> * callStrings;
 };
 
+
+
 class ExtArgBool : public ExtcapArgument
 {
+    Q_OBJECT
+
 public:
     ExtArgBool(extcap_arg * argument, QObject *parent = Q_NULLPTR);
 
@@ -197,6 +231,10 @@ public:
     virtual bool isValid();
     virtual QString defaultValue();
     virtual QString prefValue();
+    virtual bool isSetDefaultValueSupported();
+
+public Q_SLOTS:
+    virtual void setDefaultValue();
 
 private:
 
@@ -205,6 +243,8 @@ private:
     bool defaultBool();
 };
 
+
+
 class ExtArgTimestamp : public ExtcapArgument
 {
     Q_OBJECT
@@ -217,12 +257,17 @@ public:
     virtual QString defaultValue();
     virtual QString value();
     virtual QString prefValue();
+    virtual bool isSetDefaultValueSupported();
+
+public Q_SLOTS:
+    virtual void setDefaultValue();
 
 private Q_SLOTS:
     void onDateTimeChanged(QDateTime);
 
 private:
     QDateTime ts;
+    QDateTimeEdit *tsBox;
 };
 
 #endif /* UI_QT_EXTCAP_ARGUMENT_H_ */
diff --git a/ui/qt/extcap_argument_file.cpp b/ui/qt/extcap_argument_file.cpp
index 89d52627fc..bac7a5b9c4 100644
--- a/ui/qt/extcap_argument_file.cpp
+++ b/ui/qt/extcap_argument_file.cpp
@@ -59,7 +59,8 @@ QWidget * ExtcapArgumentFileSelection::createEditor(QWidget * parent)
     textBox = new QLineEdit(text, parent);
     textBox->setReadOnly(true);
 
-    const char *prefval = _argument->pref_valptr ? *_argument->pref_valptr : NULL;
+    /* Value is empty if no file is selected */
+    const char *prefval = (_argument->pref_valptr && (*_argument->pref_valptr)) ? *_argument->pref_valptr : NULL;
     if (prefval)
     {
         QString storeValue(prefval);
@@ -161,3 +162,9 @@ bool ExtcapArgumentFileSelection::isValid()
 
     return valid;
 }
+
+void ExtcapArgumentFileSelection::setDefaultValue()
+{
+    clearFilename();
+}
+
diff --git a/ui/qt/extcap_argument_file.h b/ui/qt/extcap_argument_file.h
index 1eee7e637b..9dac908d59 100644
--- a/ui/qt/extcap_argument_file.h
+++ b/ui/qt/extcap_argument_file.h
@@ -31,6 +31,8 @@ public:
 
     virtual bool isValid();
 
+    virtual void setDefaultValue();
+
 protected:
     QLineEdit * textBox;
 
diff --git a/ui/qt/extcap_argument_multiselect.cpp b/ui/qt/extcap_argument_multiselect.cpp
index 050250a416..b89e1410b2 100644
--- a/ui/qt/extcap_argument_multiselect.cpp
+++ b/ui/qt/extcap_argument_multiselect.cpp
@@ -99,6 +99,8 @@ void ExtArgMultiSelect::checkItemsWalker(QStandardItem * item, QStringList defau
             treeView->setExpanded(index, true);
             index = index.parent();
         }
+    } else {
+        item->setCheckState(Qt::Unchecked);
     }
 }
 
@@ -110,7 +112,8 @@ QWidget * ExtArgMultiSelect::createEditor(QWidget * parent)
     if (items.length() == 0)
         return new QWidget();
 
-    if (_argument->pref_valptr && *_argument->pref_valptr)
+    /* Value can be empty if no items are checked */
+    if (_argument->pref_valptr && (*_argument->pref_valptr))
     {
 #if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
         checked = QString(*_argument->pref_valptr).split(",", Qt::SkipEmptyParts);
@@ -166,7 +169,7 @@ QString ExtArgMultiSelect::value()
         ++iter;
     }
 
-    return result.join(QString(","));
+    return result.join(QString(','));
 }
 
 void ExtArgMultiSelect::itemChanged(QStandardItem *)
@@ -197,3 +200,31 @@ bool ExtArgMultiSelect::isValid()
 
     return valid;
 }
+
+QString ExtArgMultiSelect::defaultValue()
+{
+    QStringList checked;
+
+    QList<QStandardItem *> items = valueWalker(values, checked);
+
+    return checked.join(QString(','));
+}
+
+bool ExtArgMultiSelect::isSetDefaultValueSupported()
+{
+    return TRUE;
+}
+
+void ExtArgMultiSelect::setDefaultValue()
+{
+    QStringList checked;
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
+    checked = defaultValue().split(",", Qt::SkipEmptyParts);
+#else
+    checked = defaultValue().split(",", QString::SkipEmptyParts);
+#endif
+    for (int row = 0; row < viewModel->rowCount(); row++)
+        checkItemsWalker(((QStandardItemModel*)viewModel)->item(row), checked);
+}
+
diff --git a/ui/qt/extcap_argument_multiselect.h b/ui/qt/extcap_argument_multiselect.h
index a5701ac707..b64573df52 100644
--- a/ui/qt/extcap_argument_multiselect.h
+++ b/ui/qt/extcap_argument_multiselect.h
@@ -29,6 +29,11 @@ public:
 
     virtual QString value();
     virtual bool isValid();
+    virtual QString defaultValue();
+    virtual bool isSetDefaultValueSupported();
+
+public Q_SLOTS:
+    virtual void setDefaultValue();
 
 protected:
     virtual QList<QStandardItem *> valueWalker(ExtcapValueList list, QStringList &defaults);
diff --git a/ui/qt/extcap_options_dialog.cpp b/ui/qt/extcap_options_dialog.cpp
index 27bc41ca9f..550e478e62 100644
--- a/ui/qt/extcap_options_dialog.cpp
+++ b/ui/qt/extcap_options_dialog.cpp
@@ -58,7 +58,8 @@ ExtcapOptionsDialog::ExtcapOptionsDialog(QWidget *parent) :
     QDialog(parent),
     ui(new Ui::ExtcapOptionsDialog),
     device_name(""),
-    device_idx(0)
+    device_idx(0),
+    defaultValueIcon_(QApplication::style()->standardIcon(QStyle::SP_BrowserReload))
 {
     ui->setupUi(this);
 
@@ -333,6 +334,14 @@ void ExtcapOptionsDialog::updateWidgets()
             {
                 editWidget->setProperty(QString("extcap").toLocal8Bit(), VariantPointer<ExtcapArgument>::asQVariant(argument));
                 layout->addWidget(editWidget, counter, 1, Qt::AlignVCenter);
+
+                if (argument->isSetDefaultValueSupported())
+                {
+                    QPushButton *button = new QPushButton(defaultValueIcon_,"");
+                    button->setToolTip(tr("Restore default value of the item"));
+                    layout->addWidget(button, counter, 2, Qt::AlignVCenter);
+                    connect(button, SIGNAL(clicked()), argument, SLOT(setDefaultValue()));
+                }
             }
 
             if (argument->isRequired() && ! argument->isValid())
@@ -468,12 +477,13 @@ void ExtcapOptionsDialog::resetValues()
 {
     ExtcapArgumentList::const_iterator iter;
     QString value;
-    bool doStore = false;
 
     int count = ui->verticalLayout->count();
     if (count > 0)
     {
         QList<QLayout *> layouts;
+
+        /* Find all layouts */
         if (qobject_cast<QTabWidget *>(ui->verticalLayout->itemAt(0)->widget()))
         {
             QTabWidget * tabs = qobject_cast<QTabWidget *>(ui->verticalLayout->itemAt(0)->widget());
@@ -485,12 +495,14 @@ void ExtcapOptionsDialog::resetValues()
         else
             layouts.append(ui->verticalLayout->itemAt(0)->layout());
 
+        /* Loop over all layouts */
         for (int cnt = 0; cnt < layouts.count(); cnt++)
         {
             QGridLayout * layout = qobject_cast<QGridLayout *>(layouts.at(cnt));
             if (! layout)
                 continue;
 
+            /* Loop over all widgets in column 1 on layout */
             for (int row = 0; row < layout->rowCount(); row++)
             {
                 QWidget * child = Q_NULLPTR;
@@ -510,22 +522,7 @@ void ExtcapOptionsDialog::resetValues()
                         /* value<> can fail */
                         if (arg)
                         {
-                            arg->resetValue();
-
-                            /* replacing the edit widget after resetting will lead to default value */
-                            QWidget * newWidget = arg->createEditor((QWidget *) this);
-                            if (newWidget != NULL)
-                            {
-                                newWidget->setProperty(QString("extcap").toLocal8Bit(), VariantPointer<ExtcapArgument>::asQVariant(arg));
-                                QLayoutItem * oldItem = layout->replaceWidget(child, newWidget);
-                                if (oldItem)
-                                {
-                                    delete child;
-                                    delete oldItem;
-                                }
-                            }
-
-                            doStore = true;
+                            arg->setDefaultValue();
                         }
                     }
                 }
@@ -533,12 +530,8 @@ void ExtcapOptionsDialog::resetValues()
 
         }
 
-        /* this stores all values to the preferences */
-        if (doStore)
-        {
-            storeValues();
-            anyValueChanged();
-        }
+        /* Values are stored when dialog is commited, just check validity*/
+        anyValueChanged();
     }
 }
 
diff --git a/ui/qt/extcap_options_dialog.h b/ui/qt/extcap_options_dialog.h
index 6e90eef494..3799d0bce3 100644
--- a/ui/qt/extcap_options_dialog.h
+++ b/ui/qt/extcap_options_dialog.h
@@ -53,6 +53,7 @@ private:
     Ui::ExtcapOptionsDialog *ui;
     QString device_name;
     guint device_idx;
+    QIcon defaultValueIcon_;
 
     ExtcapArgumentList extcapArguments;