For our network-project I'm testing a thin client that has no harddisk and should work with the applications of a linux server through an embedded Liunx named eLux. From this thin client it is possible to start a kde on a remote server with the XDM-protocol.
That works.
But if the KDE on the server is already in use, the remote-user receives the message:

could not read network connection list
// .DCOPserver_kch145_TC148:1