Berkeley DB Reference Guide:
  RPC Client/Server

RPC FAQ

1. I get the DB_NOSERVER error back from a DB_ENV->set_rpc_server call that is using the default client timeout value.

   Some systems have a default RPC client timeout value that is too small, and the client times out the request before the server has a chance to process and reply. If you get this error, try explicitly setting the client timeout value.

Copyright (c) 1996,2008 Oracle. All rights reserved.