diff --git a/plasmoid/lib/syncthingapplet.cpp b/plasmoid/lib/syncthingapplet.cpp
index fea3047..955a2c6 100644
--- a/plasmoid/lib/syncthingapplet.cpp
+++ b/plasmoid/lib/syncthingapplet.cpp
@@ -552,7 +552,7 @@ void SyncthingApplet::handleDevicesChanged()
 void SyncthingApplet::handleInternalError(
     const QString &errorMsg, SyncthingErrorCategory category, int networkError, const QNetworkRequest &request, const QByteArray &response)
 {
-    if (!InternalError::isRelevant(m_connection, category, networkError)) {
+    if (!InternalError::isRelevant(m_connection, category, errorMsg, networkError)) {
         return;
     }
     auto error = InternalError(errorMsg, request.url(), response);
diff --git a/syncthingwidgets/misc/internalerror.cpp b/syncthingwidgets/misc/internalerror.cpp
index a4f96ec..b3098bf 100644
--- a/syncthingwidgets/misc/internalerror.cpp
+++ b/syncthingwidgets/misc/internalerror.cpp
@@ -12,11 +12,58 @@ using namespace Data;
 
 namespace QtGui {
 
+/*!
+ * \brief Returns whether to ignore inavailability after start or standby-wakeup.
+ */
+static bool ignoreInavailabilityAfterStart(
+    const Settings::Settings &settings, const SyncthingLauncher *launcher, const SyncthingService *service, const QString &message, int networkError)
+{
+    if (!settings.ignoreInavailabilityAfterStart) {
+        return false;
+    }
+
+    // ignore only certain types of errors
+    // note: Not sure how to check for "Forbidden" except for checking the error message.
+    switch (networkError) {
+    case QNetworkReply::ConnectionRefusedError:
+    case QNetworkReply::HostNotFoundError:
+    case QNetworkReply::TemporaryNetworkFailureError:
+    case QNetworkReply::NetworkSessionFailedError:
+    case QNetworkReply::ProxyConnectionRefusedError:
+    case QNetworkReply::ProxyNotFoundError:
+        break;
+    default:
+        if (message.contains(QLatin1String("Forbidden"))) {
+            break;
+        }
+        return false;
+    };
+
+    // ignore inavailable shorty after the start
+    if ((launcher && launcher->isRunning())
+#ifdef LIB_SYNCTHING_CONNECTOR_SUPPORT_SYSTEMD
+        && ((service && service->isSystemdAvailable()
+                && !service->isActiveWithoutSleepFor(launcher->activeSince(), settings.ignoreInavailabilityAfterStart))
+            || !launcher->isActiveFor(settings.ignoreInavailabilityAfterStart))
+#else
+        && !launcher->isActiveFor(settings.ignoreInavailabilityAfterStart)
+#endif
+    ) {
+        return true;
+    }
+#ifdef LIB_SYNCTHING_CONNECTOR_SUPPORT_SYSTEMD
+    if (service && !service->isActiveWithoutSleepFor(settings.ignoreInavailabilityAfterStart)) {
+        return true;
+    }
+#endif
+    return false;
+}
+
 /*!
  * \brief Returns whether the error is relevant. Only in this case a notification for the error should be shown.
  * \todo Unify with SyncthingNotifier::isDisconnectRelevant().
  */
-bool InternalError::isRelevant(const SyncthingConnection &connection, SyncthingErrorCategory category, int networkError)
+bool InternalError::isRelevant(const SyncthingConnection &connection, SyncthingErrorCategory category, const QString &message, int networkError)
 {
     // ignore overall connection errors when auto reconnect tries >= 1
     if (category != SyncthingErrorCategory::OverallConnection && category != SyncthingErrorCategory::TLS && connection.autoReconnectTries() >= 1) {
@@ -50,35 +97,6 @@ bool InternalError::isRelevant(const SyncthingConnection &connection, SyncthingE
     }
 #endif
 
-    // ignore inavailability after start or standby-wakeup
-    if (settings.ignoreInavailabilityAfterStart) {
-        switch (networkError) {
-        case QNetworkReply::ConnectionRefusedError:
-        case QNetworkReply::HostNotFoundError:
-        case QNetworkReply::TemporaryNetworkFailureError:
-        case QNetworkReply::NetworkSessionFailedError:
-        case QNetworkReply::ProxyConnectionRefusedError:
-        case QNetworkReply::ProxyNotFoundError:
-            if ((launcher && launcher->isRunning())
-#ifdef LIB_SYNCTHING_CONNECTOR_SUPPORT_SYSTEMD
-                && ((service && service->isSystemdAvailable()
-                        && !service->isActiveWithoutSleepFor(launcher->activeSince(), settings.ignoreInavailabilityAfterStart))
-                    || !launcher->isActiveFor(settings.ignoreInavailabilityAfterStart))
-#else
-                && !launcher->isActiveFor(settings.ignoreInavailabilityAfterStart)
-#endif
-            ) {
-                return false;
-            }
-#ifdef LIB_SYNCTHING_CONNECTOR_SUPPORT_SYSTEMD
-            if (service && !service->isActiveWithoutSleepFor(settings.ignoreInavailabilityAfterStart)) {
-                return false;
-            }
-#endif
-            break;
-        }
-    }
-
-    return true;
+    return !ignoreInavailabilityAfterStart(settings, launcher, service, message, networkError);
 }
 } // namespace QtGui
diff --git a/syncthingwidgets/misc/internalerror.h b/syncthingwidgets/misc/internalerror.h
index 92126ed..2e9eb61 100644
--- a/syncthingwidgets/misc/internalerror.h
+++ b/syncthingwidgets/misc/internalerror.h
@@ -19,7 +19,8 @@ namespace QtGui {
 struct SYNCTHINGWIDGETS_EXPORT InternalError {
     explicit InternalError(const QString &message = QString(), const QUrl &url = QUrl(), const QByteArray &response = QByteArray());
 
-    static bool isRelevant(const Data::SyncthingConnection &connection, Data::SyncthingErrorCategory category, int networkError);
+    static bool isRelevant(
+        const Data::SyncthingConnection &connection, Data::SyncthingErrorCategory category, const QString &message, int networkError);
 
     QString message;
     QUrl url;
diff --git a/tray/gui/trayicon.cpp b/tray/gui/trayicon.cpp
index 6f61d83..cd9988f 100644
--- a/tray/gui/trayicon.cpp
+++ b/tray/gui/trayicon.cpp
@@ -199,7 +199,7 @@ void TrayIcon::handleErrorsCleared()
 void TrayIcon::showInternalError(
     const QString &errorMessage, SyncthingErrorCategory category, int networkError, const QNetworkRequest &request, const QByteArray &response)
 {
-    if (!InternalError::isRelevant(trayMenu().widget().connection(), category, networkError)) {
+    if (!InternalError::isRelevant(trayMenu().widget().connection(), category, errorMessage, networkError)) {
         return;
     }
     auto error = InternalError(errorMessage, request.url(), response);
diff --git a/tray/gui/traywidget.cpp b/tray/gui/traywidget.cpp
index 53df842..6f6d479 100644
--- a/tray/gui/traywidget.cpp
+++ b/tray/gui/traywidget.cpp
@@ -396,7 +396,7 @@ void TrayWidget::showUsingPositioningSettings()
 void TrayWidget::showInternalError(
     const QString &errorMessage, SyncthingErrorCategory category, int networkError, const QNetworkRequest &request, const QByteArray &response)
 {
-    if (!InternalError::isRelevant(connection(), category, networkError)) {
+    if (!InternalError::isRelevant(connection(), category, errorMessage, networkError)) {
         return;
     }
     InternalErrorsDialog::addError(errorMessage, request.url(), response);