diff --git a/src/ui/control/controlmanager.cpp b/src/ui/control/controlmanager.cpp
index 13f01294..b32bff6a 100644
--- a/src/ui/control/controlmanager.cpp
+++ b/src/ui/control/controlmanager.cpp
@@ -172,6 +172,8 @@ bool ControlManager::processRequest(Control::Command command, const QVariantList
     if (Q_UNLIKELY(!w))
         return false;
 
+    // DBG: qCDebug(LC) << "Client requested: id:" << w->id() << command << args.size();
+
     OsUtil::setThreadIsBusy(true);
 
     QString errorMessage;
diff --git a/src/ui/control/controlworker.cpp b/src/ui/control/controlworker.cpp
index 68b5f448..f34e0ae7 100644
--- a/src/ui/control/controlworker.cpp
+++ b/src/ui/control/controlworker.cpp
@@ -239,6 +239,8 @@ bool ControlWorker::sendCommandData(const QByteArray &commandData)
 
 bool ControlWorker::sendCommand(Control::Command command, const QVariantList &args)
 {
+    // DBG: qCDebug(LC) << "Send Command: id:" << id() << command << args.size();
+
     const QByteArray buffer = buildCommandData(command, args);
     if (buffer.isEmpty()) {
         qCWarning(LC) << "Bad RPC command to send:" << command << args;
diff --git a/src/ui/model/connblocklistmodel.cpp b/src/ui/model/connblocklistmodel.cpp
index 20d09099..3a9d1de1 100644
--- a/src/ui/model/connblocklistmodel.cpp
+++ b/src/ui/model/connblocklistmodel.cpp
@@ -2,6 +2,7 @@
 
 #include <QFont>
 #include <QIcon>
+#include <QLoggingCategory>
 
 #include <sqlite/sqlitedb.h>
 #include <sqlite/sqlitestmt.h>
@@ -15,6 +16,12 @@
 #include <util/ioc/ioccontainer.h>
 #include <util/net/netutil.h>
 
+namespace {
+
+const QLoggingCategory LC("connBlockListModel");
+
+}
+
 ConnBlockListModel::ConnBlockListModel(QObject *parent) :
     TableSqlModel(parent), m_resolveAddress(false)
 {
diff --git a/src/ui/rpc/rpcmanager.cpp b/src/ui/rpc/rpcmanager.cpp
index beb53b5e..74551789 100644
--- a/src/ui/rpc/rpcmanager.cpp
+++ b/src/ui/rpc/rpcmanager.cpp
@@ -673,6 +673,8 @@ bool RpcManager::waitResult()
 
 void RpcManager::sendResult(ControlWorker *w, bool ok, const QVariantList &args)
 {
+    // DBG: qCDebug(LC) << "Send Result to Client: id:" << w->id() << ok << args.size();
+
     w->sendCommand(ok ? Control::Rpc_Result_Ok : Control::Rpc_Result_Error, args);
 }
 
@@ -720,6 +722,8 @@ void RpcManager::invokeOnClients(Control::Command cmd, const QVariantList &args)
         return;
     }
 
+    // DBG: qCDebug(LC) << "Invoke On Clients:" << cmd << args.size() << clients.size();
+
     if (!sendCommandDataToClients(buffer, clients)) {
         qCWarning(LC) << "Invoke on clients error:" << cmd << args;
     }