There is provided a communications network including a server forming part of a virtual private network, a plurality of client computers operative to request connection to the server and to be connected to the server when a request for connection is granted, thereby to be added to the virtual private network and a server response module, operative, in response to a connection request from at least one of the plurality of client computers which connection request cannot be processed by the server, to provide to the at least one of said plurality of client computers a server response indicating that the connection request should be retransmitted only after at least one criterion is met.