svc = this.service;
                if ( svc == null ) {
                    // there still is some kind of race condition, where?
                    // this used to trigger "invalid operation..."
                    throw new SmbException("Service is null in state " + this.connectionState.get());
                }
                checkRequest(transport, req, svc);

            }

                throw new SmbException("Invalid operation for workgroups, servers, or shares");
            }

            if ( !sh.isSameTree(th) ) {
                // trigger requests to resolve the actual target
                exists();
                dest.exists();