Hi, The problem is there. I have checked and I have no such header. I have the same configuration file on both my NAS. { "device_name" : "NAME", "listening_port" : 7777, "storage_path" : "/c/btsync", "pid_file" : "/c/btsync/btsync.pid", "check_for_updates" : true, "disk_low_priority" : false, "folder_rescan_interval" : 1500, "use_upnp" : false, "log_size" : 10, "download_limit" : 0, "upload_limit" : 0, "webui" : { "listen" : "0.0.0.0:8888", "login" : "admin", "password" : "password" }}