Methods of migrating clients from a first server to a second server are described. The first server sends a message to the second server identifying a set of clients to be migrated, serializes the state of one or more objects associated with the set of clients and transmits the serialized state to the second server. The first server then instructs each client in the set of clients to establish a connection to the second server such that each client is connected in parallel to both the first and second servers with the connection to the first server as a primary connection and the connection to the second server as a secondary connection and when the clients are connected to the second server, the first server instructs the clients to disconnect from the first server and switch the primary connection to be the connection with the second server.