I'm having some problems getting btsync working. Here is my setup: Server:: I've been trying to setup btsync on a headless Ubuntu (12.04 64 Bit) server using BitTorrent Sync 1.1.48 [btsync_x64.tar.gz] Client:: I'm using the OSX Bittorrent Sync 1.1.48 (1.1.48) client. Problem:: I've been able to get client and server both running, I've been able to connect and configure the server using the Web UI, and I've (after that didn't sync - see config JSON given below) also tried setting up the server using a sync.conf file too. I've got no error messages. The problem is that they just won't see each other/sync, so I suspect it's a firewall/router issue. I've included my iptables rules below. I've done all the regular stuff with setting up sharing (generating a hash, adding it on both servers etc), but just nothing starts up. I'd sure appreciate it if anyone could just check there's nothing obvious that I might have missed. More info: Here is my sync.conf file, which I am loading like so: ~/.btsync/btsync --config ~/.btsync/sync.conf (comments removed) sync.conf file: { "device_name": "Capsicum Sync Server", "listening_port" : 44738, "storage_path" : "/home/ian/.btsync", "check_for_updates" : true, "use_upnp" : true, "download_limit" : 0, "upload_limit" : 0, "webui" : { // "listen" : "0.0.0.0:8888", "login" : "admin", "password" : "password" } , "shared_folders" : [ { "secret" : "ADDK4FEGH3LY7JEJ5ZCXWUKDCSVSQZTZL", "dir" : "/home/ian/BTSync_two", "use_relay_server" : true, "use_tracker" : true, "use_dht" : true, "search_lan" : false, "use_sync_trash" : true, "known_hosts" : [ "46.165.251.69:51547" ] } ] } MY IPTABLES RULES: *filter # Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0 -A INPUT -i lo -j ACCEPT -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT # Accepts all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allows all outbound traffic # You can modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allows HTTP and HTTPS connections from anywhere (the normal ports for websites) -A INPUT -p tcp --dport 80 -j ACCEPT -A INPUT -p tcp --dport 443 -j ACCEPT # Allows SSH connections # # THE -dport NUMBER IS THE SAME ONE YOU SET UP IN THE SSHD_CONFIG FILE # -A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT # Allow ping -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT # btsync: -A INPUT -p tcp --dport 3838 -j ACCEPT -A INPUT -p udp --dport 3838 -j ACCEPT -A INPUT -p tcp --dport 44738 -j ACCEPT -A INPUT -p udp --dport 44738 -j ACCEPT # log iptables denied calls -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT "Please let Sync collect logs for at least 15 minutes to get enough information." OK - I've attached these files, both for the server and the OSX client. (after enabling debugging with echo "FFFF" > .sync/debug.txt on the server). Note, I'm seeing this on OSX - does this mean it's at least *seeing* the server: Here's hopefully.. Ian, @id iptables_rules.txt osx-sync.log.txt server-sync.log.txt