diff --git a/LibInstructorsAndTrainees/connectorToServer/Core/recognizesystem.cpp b/LibInstructorsAndTrainees/connectorToServer/Core/recognizesystem.cpp
index de7edb9..466e8bd 100644
--- a/LibInstructorsAndTrainees/connectorToServer/Core/recognizesystem.cpp
+++ b/LibInstructorsAndTrainees/connectorToServer/Core/recognizesystem.cpp
@@ -592,6 +592,28 @@ void RecognizeSystem::xmlParser(QByteArray array)
 
         }
 
+        if(xmlReader.name() == "TryBlock")
+        {
+            bool result = false;
+            QString type = "";
+
+            foreach(const QXmlStreamAttribute &attr, xmlReader.attributes())
+            {
+                QString name = attr.name().toString();
+                QString value = attr.value().toString();
+
+                if (name == "Result"){
+                    result = value == "true" ? true : false;
+                }
+
+                if (name == "Type"){
+                    type = value;
+                }
+            }
+
+            emit sigTryBlock(result, type);
+        }
+
 
         if(xmlReader.name() == "VersionList")
         {
diff --git a/LibInstructorsAndTrainees/connectorToServer/Core/recognizesystem.h b/LibInstructorsAndTrainees/connectorToServer/Core/recognizesystem.h
index 56f1c6f..d9b5b1b 100644
--- a/LibInstructorsAndTrainees/connectorToServer/Core/recognizesystem.h
+++ b/LibInstructorsAndTrainees/connectorToServer/Core/recognizesystem.h
@@ -37,6 +37,7 @@ signals:
     void sigErrorAuth(QString error);
     void sigAuth(ServerAuthorization *serverAuth);
     void sigDeAuth(ServerDeAuthorization *serverDeAuth);
+    void sigTryBlock(bool result, QString type);
     void sigAnswerQueryToDB(QList<Instructor>* listInstructors,
                             QList<Trainee>* listTrainees,
                             QList<Group>* listGroups);
diff --git a/LibInstructorsAndTrainees/connectorToServer/connectortoserver.cpp b/LibInstructorsAndTrainees/connectorToServer/connectortoserver.cpp
index dec6cfa..7208aa4 100644
--- a/LibInstructorsAndTrainees/connectorToServer/connectortoserver.cpp
+++ b/LibInstructorsAndTrainees/connectorToServer/connectortoserver.cpp
@@ -150,6 +150,8 @@ void ConnectorToServer::bindConnection()
     connect(recognizeSystem,&RecognizeSystem::sigAuth,this,&ConnectorToServer::slot_Auth);
     connect(recognizeSystem,&RecognizeSystem::sigDeAuth,this,&ConnectorToServer::sigDeLoginResult);
 
+    connect(recognizeSystem,&RecognizeSystem::sigTryBlock,this,&ConnectorToServer::sigTryBlockResult);
+
     connect(recognizeSystem,&RecognizeSystem::sigServerBlocked,this,&ConnectorToServer::slot_ServerBlocked);
     connect(recognizeSystem,&RecognizeSystem::sigErrorAuth,this,&ConnectorToServer::slot_ErrorAuth);
 
diff --git a/LibInstructorsAndTrainees/connectorToServer/connectortoserver.h b/LibInstructorsAndTrainees/connectorToServer/connectortoserver.h
index bbaa682..d884ec9 100644
--- a/LibInstructorsAndTrainees/connectorToServer/connectortoserver.h
+++ b/LibInstructorsAndTrainees/connectorToServer/connectortoserver.h
@@ -130,6 +130,9 @@ signals:
 
     void sigLoginResult(ServerAuthorization * serverAuth);
     void sigDeLoginResult(ServerDeAuthorization * serverDeAuth);
+
+    void sigTryBlockResult(bool result, QString type);
+
     void sigServerBlocked();
     void sigErrorAuth(QString error);
 
diff --git a/LibInstructorsAndTrainees/instructorsandtraineeswidget.cpp b/LibInstructorsAndTrainees/instructorsandtraineeswidget.cpp
index 8f34e79..f472fff 100644
--- a/LibInstructorsAndTrainees/instructorsandtraineeswidget.cpp
+++ b/LibInstructorsAndTrainees/instructorsandtraineeswidget.cpp
@@ -51,6 +51,9 @@ InstructorsAndTraineesWidget::InstructorsAndTraineesWidget(QWidget *parent) :
     connectorToServer = new ConnectorToServer();
     connect(connectorToServer, &ConnectorToServer::sigLoginResult, this, &InstructorsAndTraineesWidget::slot_checkLoginResult);
     connect(connectorToServer, &ConnectorToServer::sigDeLoginResult, this, &InstructorsAndTraineesWidget::slot_checkDeLoginResult);
+
+    connect(connectorToServer, &ConnectorToServer::sigTryBlockResult, this, &InstructorsAndTraineesWidget::slot_checkTryBlockResult);
+
     connect(connectorToServer, &ConnectorToServer::sigServerBlocked, this, &InstructorsAndTraineesWidget::slot_ServerBlocked);
     connect(connectorToServer, &ConnectorToServer::sigErrorAuth, this, &InstructorsAndTraineesWidget::slot_ErrorAuth);
     connect(connectorToServer, &ConnectorToServer::signal_SetVersion, this, &InstructorsAndTraineesWidget::slot_SetVersion);
@@ -289,6 +292,11 @@ void InstructorsAndTraineesWidget::slot_checkDeLoginResult(ServerDeAuthorization
     }
 }
 
+void InstructorsAndTraineesWidget::slot_checkTryBlockResult(bool result, QString type)
+{
+
+}
+
 void InstructorsAndTraineesWidget::slot_ServerBlocked()
 {
     if(flTryLogin)
@@ -695,6 +703,8 @@ void InstructorsAndTraineesWidget::on_btnSettings_clicked()
     connect(dlgSettings, &DialogSettings::signal_LanguageChanged, this, &InstructorsAndTraineesWidget::slot_LanguageChanged);
     connect(dlgSettings, &DialogSettings::signal_UpdateStyleSheet, this, &InstructorsAndTraineesWidget::slot_UpdateStyleSheet);
 
+    connect(connectorToServer, &ConnectorToServer::sigTryBlockResult, dlgSettings, &DialogSettings::slot_checkTryBlockResult);
+
     switch( dlgSettings->exec() )
     {
     case QDialog::Accepted:
diff --git a/LibInstructorsAndTrainees/instructorsandtraineeswidget.h b/LibInstructorsAndTrainees/instructorsandtraineeswidget.h
index 23d1bb4..40b2183 100644
--- a/LibInstructorsAndTrainees/instructorsandtraineeswidget.h
+++ b/LibInstructorsAndTrainees/instructorsandtraineeswidget.h
@@ -54,6 +54,8 @@ public Q_SLOTS:
     //Слот обработки результата деавторизации
     void slot_checkDeLoginResult(ServerDeAuthorization * serverDeAuth);
 
+    void slot_checkTryBlockResult(bool result, QString type);
+
     void slot_ServerBlocked();
     void slot_ErrorAuth(QString error);
     void slot_SetVersion(StreamingVersionData* serverVersion);
diff --git a/LibInstructorsAndTrainees/settings/dialogsettings.cpp b/LibInstructorsAndTrainees/settings/dialogsettings.cpp
index 2798cce..3600e3f 100644
--- a/LibInstructorsAndTrainees/settings/dialogsettings.cpp
+++ b/LibInstructorsAndTrainees/settings/dialogsettings.cpp
@@ -5,6 +5,7 @@
 #include <QXmlStreamReader>
 #include <QRegExpValidator>
 #include "dialogversioncontrol.h"
+#include "specialmessagebox.h"
 
 DialogSettings::DialogSettings(ConnectorToServer* connectorToServer, bool instructorIsLogged, QWidget *parent) :
     QDialog(parent),
@@ -12,7 +13,8 @@ DialogSettings::DialogSettings(ConnectorToServer* connectorToServer, bool instru
     settings(nullptr),
     connectorToServer(nullptr),
     dlgVersionControl(nullptr),
-    flSettingsServerChanged(false)
+    flSettingsServerChanged(false),
+    flTryVersionControl(false)
 {
     ui->setupUi(this);
 
@@ -214,19 +216,12 @@ void DialogSettings::on_btnSetVersion_clicked()
     if(connectorToServer)
         if(connectorToServer->getIsConnected())
         {
+            flTryVersionControl = true;
+
             connectorToServer->sendQueryBlockAuth(true, "VersionControl");
 
-            dlgVersionControl = new DialogVersionControl(connectorToServer, this);
-            dlgVersionControl->initialize(connectorToServer->getLoginName());
-            dlgVersionControl->exec();
-
-            if(dlgVersionControl)
-            {
-                delete dlgVersionControl;
-                dlgVersionControl = nullptr;
-            }            
-
-            connectorToServer->sendQueryBlockAuth(false, "VersionControl");
+            //TODO пока сразу
+            //slot_VersionControl();
         }
 }
 
@@ -258,3 +253,38 @@ void DialogSettings::on_DialogSettings_accepted()
 
     emit signal_LanguageChanged(language);
 }
+
+void DialogSettings::slot_VersionControl()
+{
+    dlgVersionControl = new DialogVersionControl(connectorToServer, this);
+    dlgVersionControl->initialize(connectorToServer->getLoginName());
+    dlgVersionControl->exec();
+
+    if(dlgVersionControl)
+    {
+        delete dlgVersionControl;
+        dlgVersionControl = nullptr;
+    }
+
+    connectorToServer->sendQueryBlockAuth(false, "VersionControl");
+}
+
+void DialogSettings::slot_checkTryBlockResult(bool result, QString type)
+{
+    if(flTryVersionControl)
+    {
+        if(type == "VersionControl")
+        {
+            if(result)
+            {//Одобрено
+                slot_VersionControl();
+            }
+            else
+            {//Отказ
+                SpecMsgBox::WarningClose(this, tr("The server rejected your request to access version control.\nAnother instructor is managing versions.\nPlease try again later."));
+            }
+
+            flTryVersionControl = false;
+        }
+    }
+}
diff --git a/LibInstructorsAndTrainees/settings/dialogsettings.h b/LibInstructorsAndTrainees/settings/dialogsettings.h
index 0712cab..3577d26 100644
--- a/LibInstructorsAndTrainees/settings/dialogsettings.h
+++ b/LibInstructorsAndTrainees/settings/dialogsettings.h
@@ -46,6 +46,11 @@ private slots:
     void on_editPort_textChanged(const QString &arg1);
     void on_DialogSettings_accepted();
 
+public slots:
+    void slot_VersionControl();
+
+    void slot_checkTryBlockResult(bool result, QString type);
+
 private:    
     bool saveSettings();
 
@@ -59,6 +64,8 @@ private:
     DialogVersionControl *dlgVersionControl;
 
     bool flSettingsServerChanged;
+
+    bool flTryVersionControl;
 };
 
 #endif // DIALOGSETTINGS_H
diff --git a/LibServer/Systems/Parsers/clientanswerparser.cpp b/LibServer/Systems/Parsers/clientanswerparser.cpp
index e1ce8b3..cae3427 100644
--- a/LibServer/Systems/Parsers/clientanswerparser.cpp
+++ b/LibServer/Systems/Parsers/clientanswerparser.cpp
@@ -43,6 +43,20 @@ QByteArray ClientAnswerParser::deAuthorization(bool result, QString login)
     return dataParser->xmlAnswer(listTag);
 }
 
+QByteArray ClientAnswerParser::tryBlock(bool result, QString type)
+{
+    QList<SXmlAnswerTag> listTag;
+
+    SAttribute attribute1 = {"Result", result? "true" : "false"};
+    SAttribute attribute2 = {"Type", type};
+    QList<SAttribute> listAttr = {attribute1, attribute2};
+    SXmlAnswerTag tag = {"TryBlock", listAttr};
+
+    listTag.append(tag);
+
+    return dataParser->xmlAnswer(listTag);
+}
+
 QByteArray ClientAnswerParser::message(QString loginFrom,QString loginTo,QString text)
 {
     QList<SXmlAnswerTag> listTag;
diff --git a/LibServer/Systems/Parsers/clientanswerparser.h b/LibServer/Systems/Parsers/clientanswerparser.h
index 423b4e5..81ed702 100644
--- a/LibServer/Systems/Parsers/clientanswerparser.h
+++ b/LibServer/Systems/Parsers/clientanswerparser.h
@@ -16,6 +16,7 @@ public:
 
     QByteArray authorization(bool result, QString instructorName, QString clientName, QString accessType, QString login, int id);
     QByteArray deAuthorization(bool result, QString login);
+    QByteArray tryBlock(bool result, QString type);
     QByteArray message(QString loginFrom,QString loginTo,QString text);
     QByteArray task(QString text);
     QByteArray notify(QString code);
diff --git a/LibServer/Systems/processingsystem.cpp b/LibServer/Systems/processingsystem.cpp
index 7474693..c6c1d2a 100644
--- a/LibServer/Systems/processingsystem.cpp
+++ b/LibServer/Systems/processingsystem.cpp
@@ -188,7 +188,19 @@ void ProcessingSystem::processingClientDeAutorization(ClientHandler *client, Cli
 
 void ProcessingSystem::processingClientBlockAuth(ClientHandler *client, bool block, QString type)
 {
+    QByteArray arrayAnswer;
+
     bool res = emit providerDBLMS->signal_BlockAutorization(block, client->getClient()->getFullName(), type);
+
+    if(res)
+    {//Блокировка одобрена
+       arrayAnswer = dataParser->ClientAnswer()->tryBlock(true, type);
+    }
+    else
+    {//Отказ
+        arrayAnswer = dataParser->ClientAnswer()->tryBlock(false, type);
+    }
+    client->sendXmlAnswer(arrayAnswer);
 }
 
 //упращенная деавторизация при выключении сервера
diff --git a/LibServer/multithreadserver/multithreadserver.cpp b/LibServer/multithreadserver/multithreadserver.cpp
index 00f1088..5c440af 100644
--- a/LibServer/multithreadserver/multithreadserver.cpp
+++ b/LibServer/multithreadserver/multithreadserver.cpp
@@ -149,16 +149,50 @@ void MultiThreadServer::slotDisconnectClient(QString peerAddress, QString peerPo
 
 bool MultiThreadServer::slot_BlockAutorization(bool block, QString whoFullName, QString type)
 {
-    bool res = true;
+    bool res = false;
     bool blockRes = false;
     QString key = whoFullName + " [type:" + type + "]";
     QString strTypes = "";
 
     if(block)
     {
-        this->blockAutorization();
-        blockersMap.insert(key, type);
-        blockRes = true;
+        if(whoFullName == "SERVER")
+        {
+            this->blockAutorization();
+            blockersMap.insert(key, type);
+            blockRes = true;
+            res = true;
+        }
+        else
+        {
+            bool flExist = false;
+
+            foreach(QString keyLocal, blockersMap.keys())
+            {
+                if(blockersMap[keyLocal] == type)
+                {
+                    flExist = true;
+                    break;
+                }
+            }
+
+            if(!flExist)
+            {
+                this->blockAutorization();
+                blockersMap.insert(key, type);
+                blockRes = true;
+                res = true;
+            }
+            else
+            {
+                if(!blockersMap.count())
+                    blockRes = false;
+                else
+                    blockRes = true;
+
+                res = false;
+            }
+        }
     }
     else
     {
@@ -170,6 +204,8 @@ bool MultiThreadServer::slot_BlockAutorization(bool block, QString whoFullName,
         }
         else
             blockRes = true;
+
+        res = true;
     }
 
     if(res)