diff --git a/src/protocol.cpp b/src/protocol.cpp
index 145d5afc..5061fb88 100755
--- a/src/protocol.cpp
+++ b/src/protocol.cpp
@@ -2375,10 +2375,18 @@ bool CProtocol::EvaluateCLRegisterServerResp ( const CHostAddress&     InetAddr,
         return true;
     }
 
-    ESvrRegResult eResult = static_cast<ESvrRegResult> ( GetValFromStream ( vecData, iPos, 1 ) );
+    // server registration result (1 byte)
+    const int iSvrRegResult = static_cast<int> ( GetValFromStream ( vecData, iPos, 1 ) );
+
+    if ( ( iSvrRegResult != SRR_REGISTERED ) &&
+         ( iSvrRegResult != SRR_CENTRAL_SVR_FULL ) &&
+         ( iSvrRegResult != SRR_VERSION_TOO_OLD ) )
+    {
+        return true;
+    }
 
     // invoke message action
-    emit CLRegisterServerResp ( InetAddr,  eResult );
+    emit CLRegisterServerResp ( InetAddr,  static_cast<ESvrRegResult> ( iSvrRegResult ) );
 
     return false; // no error
 }
diff --git a/src/serverdlg.cpp b/src/serverdlg.cpp
index 9a829dea..f6da4168 100755
--- a/src/serverdlg.cpp
+++ b/src/serverdlg.cpp
@@ -636,6 +636,7 @@ void CServerDlg::UpdateGUIDependencies()
     case SRS_BAD_ADDRESS:
     case SRS_TIME_OUT:
     case SRS_CENTRAL_SVR_FULL:
+    case SRS_VERSION_TOO_OLD:
         strStatus = "<font color=""red""><b>" + strStatus + "</b></font>";
         break;
 
diff --git a/src/serverlist.cpp b/src/serverlist.cpp
index b2a542b1..b6d51e88 100755
--- a/src/serverlist.cpp
+++ b/src/serverlist.cpp
@@ -511,6 +511,10 @@ void CServerListManager::StoreRegistrationResult ( ESvrRegResult eResult )
         SetSvrRegStatus ( ESvrRegStatus::SRS_CENTRAL_SVR_FULL );
         break;
 
+    case ESvrRegResult::SRR_VERSION_TOO_OLD:
+        SetSvrRegStatus ( ESvrRegStatus::SRS_VERSION_TOO_OLD );
+        break;
+
     default:
         SetSvrRegStatus ( ESvrRegStatus::SRS_UNKNOWN_RESP );
         break;
diff --git a/src/util.h b/src/util.h
index 71e5babf..906fa541 100755
--- a/src/util.h
+++ b/src/util.h
@@ -569,6 +569,7 @@ enum ELicenceType
 // Server jam recorder state enum ----------------------------------------------
 enum ERecorderState
 {
+    // used for protocol -> enum values must be fixed!
     RS_UNDEFINED = 0,
     RS_NOT_INITIALISED = 1,
     RS_NOT_ENABLED = 2,
@@ -579,8 +580,8 @@ enum ERecorderState
 // Channel sort type -----------------------------------------------------------
 enum EChSortType
 {
-    ST_BY_NAME = 0,
-    ST_BY_INSTRUMENT = 1
+    ST_BY_NAME,
+    ST_BY_INSTRUMENT
 };
 
 
@@ -624,13 +625,14 @@ inline QString csCentServAddrTypeToString ( ECSAddType eAddrType )
 // Slave server registration state ---------------------------------------------
 enum ESvrRegStatus
 {
-    SRS_UNREGISTERED = 0,
-    SRS_BAD_ADDRESS = 1,
-    SRS_REQUESTED = 2,
-    SRS_TIME_OUT = 3,
-    SRS_UNKNOWN_RESP = 4,
-    SRS_REGISTERED = 5,
-    SRS_CENTRAL_SVR_FULL = 6
+    SRS_UNREGISTERED,
+    SRS_BAD_ADDRESS,
+    SRS_REQUESTED,
+    SRS_TIME_OUT,
+    SRS_UNKNOWN_RESP,
+    SRS_REGISTERED,
+    SRS_CENTRAL_SVR_FULL,
+    SRS_VERSION_TOO_OLD
 };
 
 inline QString svrRegStatusToString ( ESvrRegStatus eSvrRegStatus )
@@ -657,6 +659,9 @@ inline QString svrRegStatusToString ( ESvrRegStatus eSvrRegStatus )
 
     case SRS_CENTRAL_SVR_FULL:
         return QCoreApplication::translate ( "CServerDlg", "Central Server full" );
+
+    case SRS_VERSION_TOO_OLD:
+        return QCoreApplication::translate ( "CServerDlg", "Your server version is too old" );
     }
 
     return QString ( QCoreApplication::translate ( "CServerDlg", "Unknown value " ) ).append ( eSvrRegStatus );
@@ -668,7 +673,8 @@ enum ESvrRegResult
 {
     // used for protocol -> enum values must be fixed!
     SRR_REGISTERED = 0,
-    SRR_CENTRAL_SVR_FULL = 1
+    SRR_CENTRAL_SVR_FULL = 1,
+    SRR_VERSION_TOO_OLD = 2
 };