Is there any disadvantage in using a different port instead of default in Bitcoin Core?
Had to change the default port because of my VPN, but noticed a severe reduction in the amount of sent data Used to be 2-3gb per day, now it's 400-500mb at max I'm running a node at the sole purpose of helping the network so this is vital to me EDIT: There is, this is directly from Bitcoin core code
// do not allow non-default ports, unless after 50 invalid addresses selected already if (addr.GetPort() != Params().GetDefaultPort() && nTries < 50) continue;
Running BitCoin Core v 0.17.1 - should I open ports on the router/firewall?
I'm running Bitcoin Core 24/7 to support BTC and the community. I read a post that most routers block some port that is needed for the network. I keep my Asus RT-AC66U's firmware updated but that is the maximum I know about routers and ports. Should I do something with my router settings? Advice would be most appreciated. :)
I run Bitcoin Core and Armory. People keep saying I need to set the Bitcoin Core port to 8333 to be contributing a full node and accept incoming connections. I'm cool with contributing, but is there any security risk at all with people knowing which port I might have open? Or should I just do a Jack Bauer and get Chloe to open me a socket? :p
Bitcoin Core full-node technical question: how to customize port?
I want to open full-node to incoming connections, but I am unable to open 8333 because it is already taken on my VPN. There are however other ports available for me to use. Question is, how would I go about changing the port that my Bitcoin Core client uses? A DuckDuckGo search hasn't yielding any clear answer on this subject, other than it is possible to change the port that the Core client uses in the CLI.
PSA: If you are running Bitcoin Core and you are not forwarding port 8333 (peering only 8 connections) then younare not running a full node.
To quote Gavin Andresen:
Most ordinary folks should NOT be running a full node. We need full nodes that are always on, have more than 8 connections (if you have only 8 then you are part of the problem, not part of the solution), and have a high-bandwidth connection to the Internet. So: if you've got an extra virtual machine with enough memory in a data center, then yes, please, run a full node.
Edit: according to nullc and pwuille, by running Bitcoin Core (or XT) you help reinforce the rules of the network by verifying transactions even if you do not help network propagation as you would if you opened the ports. So you do add value to the network (and specifically yourself because trustless). Also, it is probably poor advice to abdicate control of your node to a data center.
Can't get more than 8 connections in bitcoin core client. Open port, maxconnections=200, nothing works.
Using Bitcoin Core v0.14.1. Port 8333 is forwarded to the correct machine, the firewall on the computer has that port open, I tested that the port is open from outside (https://www.grc.com/x/portprobe=8333), the client is configured to accept incoming connections. But it stays at 8 connections. The only strange thing is that I have a bitcoin.conf file that has dbcache=4000 and maxconnections=200, but when I open the preferences panel it only shows the dbcache override. I thought I might have edited the wrong conf file but as far as I can tell it's the right one. Anyone has any ideas? Am I missing something? Thanks for any help! EDIT: I'm an idiot. Everything was working correctly, but it turns out maxconnections affects the number of incoming connections and the bitcoin-qt client only reports the number of outgoing connections, which is hard limited to 8.
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Security risks involved using Bitcoin Core Wallet as your main wallet + port 8333 open.
Hey guys, I've been using Bitcoin Core Wallet on a clean windows 10 machine as my main bitcoin wallet. I don't want this thread to be about what wallet is safest, as I know there are better options than the Bitcoin Core Wallet. I recently opened port 8333 and verified the machine as an operational full node to help the network. My question is simply, did opening port 8333 add any additional risks to my bitcoin's security than a normal Bitcoin Core Wallet has without port 8333 being opened? Thanks guys!
You Really Ought to Run Bitcoin Core If You Own Any Bitcoin Anywhere
Just about everyone I know is now racing to buy bitcoin. That's great. I'm advising everyone to run Bitcoin Core if they've got some hard disk space - even if it's in pruned mode. Why? Because every node out there adds robustness to the network, validates each transaction, validates each block, relays blocks and transactions and makes any attack on bitcoin's network less feasible. So if you've got value stored in bitcoin, increase the strength and value of the network in a cheap way by running Bitcoin Core. NB: This is not to say you need to hold or even monitor your coins using bitcoin core, although it's very good for that too. It's just to say that you running bitcoin core is good for bitcoin and so is it's in your interest to do so.
PSA: Full nodes running Bitcoin Core version 0.11.1 or higher need to have port 8333 forwarded explicitly
Universal Plug and Play has been disabled by default from version 0.11.1 onwards. So if you're running Bitcoin Core as a full node and have recently upgraded to 0.11.1 or higher and were previously relying on UPnP to automatically forward port 8333, you now need to explicitly configure your router to forward that port. The reason for disabling UPnP by default was because a buffer overflow vulnerability was found (http://www.talosintel.com/reports/TALOS-2015-0035/) in the miniupnpc library (which I think has now been fixed), however it has been determined that the miniupnpc codebase likely contains further vulnerabilities, and so to be on the safe side UPnP has been diabled by default to prevent UPnP vulnerabilities being a structural danger to the network. See the release notes: https://bitcoin.org/en/release/v0.11.1 and the pull request: https://github.com/bitcoin/bitcoin/pull/6795 for more details.
Click the large blue Download Bitcoin Core button to download the Bitcoin Core installer to your Downloads folder. Optional: Verify the release signatures. If you know how to use PGP, you should also click the Verify Release Signatures link on the download page to download a signed list of SHA256 file hashes. The 0.11 and later releases are signed by Wladimir J. van der Laan’s releases key w Bitcoin Core is a community-driven free software project, released under the MIT license. Verify release signatures Download torrent Source code Show version history. Bitcoin Core Release Signing Keys v0.8.6 - 0.9.2.1 v0.9.3 - 0.10.2 v0.11.0+ Or choose your operating system. Windows exe - zip. Mac OS X dmg - tar.gz. Linux (tgz) 64 bit. ARM Linux 64 bit - 32 bit. Linux (Snap Store) Support ... P2P Network¶. This section describes the Bitcoin P2P network protocol (but it is not a specification).It does not describe the discontinued direct IP-to-IP payment protocol, the deprecated BIP70 payment protocol, the GetBlockTemplate mining protocol, or any network protocol never implemented in an official version of Bitcoin Core.. All peer-to-peer communication occurs entirely over TCP. If you don't want to, you don't have to open ports at all. You'll still have a full node, it will just have fewer connections. Full nodes usually make 8 outgoing connections and can have many more incoming if you have the port open (for a total of 125 by default). Install Bitcoin Core on a machine with 100s of gigabytes of free space. Allow it to download the blockchain. This could take days. Replace the wallet.dat file on the new machine with your old one. Start Bitcoin Core on the new machine with the rescan flag, to scan the blockchain for your newly
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