Fix: clear residual image outside remote frame in non-adaptive scroll mode

server/2015Remote/2015RemoteDlg.cpp

@@ -5818,6 +5818,7 @@ VOID CMy2015RemoteDlg::MessageHandle(CONTEXT_OBJECT* ContextObject)
                 ack.status = CONN_AUTH_CLOCK_SKEW;
                 Mprintf("[ConnAuth] %s: 时钟偏差 %lld 秒，拒绝\n",
                         ContextObject->GetPeerName().c_str(), skew);
+                PostMessageA(WM_SHOWMESSAGE, (WPARAM)new CharMsg("Connection AUTH failed. Please check the client's time."), NULL);
             } else {
                 BYTE sigInput[8 + 8 + 16];
                 memcpy(sigInput,      &pkt->clientID,  8);