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. :)
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.
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
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.
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!
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.
The Bitcoin.com mining pool has the lowest share reject rate (0.15%) we've ever seen. Other pools have over 0.30% rejected shares. Furthermore, the Bitcoin.com pool has a super responsive and reliable support team. The bitcoin.org client can be configured to accept JSON-RPC communications, and when that is enabled will, by default, be on port 8332. Earlier versions of Bitcoin Core permitted this to be secured with SSL communications using the same port or a different port, however that capability has since been removed. Depending on the network (mode) the Bitcoin Core daemon is running as well as the chosen runtime flags, several default ports may be available for mapping. Ports can be exposed by mapping all of the available ones (using -P and based on what EXPOSE documents) or individually by adding -p . 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). Bitcoin Core’s wallet currently scans any bare multisig payments to see if every public key used is part of the user’s wallet and, if so, categorizes the payment as InMine to indicate that it’s spendable by the user. Discussion: Pieter Wuille requested the topic. He described the current behavior as, “stupid, annoying, pointless, and
Bitcoin JSON-RPC Tutorial 4 - Command Line Interface
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