QLocalServer IPC client works, server not

Question

okay this one seems tricky. I implemented a QLocalServer to do some IPC. But it won't work properly. The client connects and tells me he is connected. the server...well...not, which makes me unable to recieve any messages.

the server implementation looks like this:

PipeServer::PipeServer(QString servername, QObject *parent) : QObject(parent) {
    m_server = new QLocalServer(this);
    m_server->setSocketOptions(QLocalServer::WorldAccessOption);

    if (!m_server->listen(servername)) {
        logToFile("Unable to start the Server");
    } else {
        logToFile("Server up and running");
    }

    connect(m_server, SIGNAL(newConnection()), this, SLOT(socket_new_connection()));
}

void PipeServer::socket_new_connection() {

    logToFile("incoming connection");

    /* handling of connection ... */

}

output server:

[Debug]: Server up and running

output client:

[Debug]: ConnectingState 
[Debug]: ConnectedState 
[Debug]: socket_connected 

output client with no running server:

[Debug]: ConnectingState 
[Debug]: UnconnectedState 
[Debug]: socket_error 
[Debug]: ServerNotFoundError 

client output if i close the server while the client is connected:

[Debug]: ClosingState 
[Debug]: UnconnectedState 
[Debug]: socket_disconnected 

so the client is definitely connecting to the server, but the server's newConnection() signal is never called. i even tried to check the connection myself with m_server->hasPendingConnections() ...but that returns false, too...

[edit]

i check the server status every 30 seconds:

void PipeServer::checkListening(){

if(m_server->isListening()){
    logToFile("server is listening");
} else {
    logToFile("server is NOT listening");
}

if(m_server->hasPendingConnections()){
    logToFile("server has pending connections");
} else {
    logToFile("server has no pending connections");
}

}

which outputs:

[Debug]: server is listening
[Debug]: server has no pending connections