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Title: Possible firewall problem with ubuntu server and bitcoind Post by: Fr0stst0rm on September 20, 2016, 04:36:21 PM Hello. I have an ubuntu server on which several VMs are running and I want to use one VM as Bitcoin Node. I installed everything according to the tutorial on bitcoin.org and bitcoind is running, but it is not syncing the blockchain. Users on reddit suggested, that there might be a problem with the firewall.
Which other ports except port 8333 do i need to forward to the VM? Or is there another problem with my installation? Output of bitcoin-cli getinfo: "version": 130000, "protocolversion": 70014, "walletversion": 130000, "balance": 0.00000000, "blocks": 0, "timeoffset": 0, "connections": 1, "proxy": "", "difficulty": 1, "testnet": false, "keypoololdest": 1474373107, "keypoolsize": 100, "paytxfee": 0.00000000, "relayfee": 0.00001000, "errors": "" Title: Re: Possible firewall problem with ubuntu server and bitcoind Post by: achow101 on September 20, 2016, 05:01:24 PM You need to allow both incoming and outgoing connections to and from port 8333
Title: Re: Possible firewall problem with ubuntu server and bitcoind Post by: Fr0stst0rm on September 20, 2016, 05:55:21 PM You are right the port is not open for outgoing connections.
I use a qemu hook to do the port forwarding. Here is the important part of the qemu hook: iptables -t nat -I PREROUTING -p tcp --dport 8333 -j DNAT --to $Guest5_ip:8333 iptables -I FORWARD -d $Guest5_ip/32 -p tcp -m state --state NEW -m tcp \ --dport 8333 -j ACCEPT How do i open the port for outgoing connections? Title: Re: Possible firewall problem with ubuntu server and bitcoind Post by: achow101 on September 20, 2016, 06:06:09 PM How do i open the port for outgoing connections? I'm not quite sure as I am not particularly familiar with iptables. I do know that it's something likeCode: iptables -A OUTPUT .... |