Questions tagged [firewalls]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
46
votes
1answer
46k views

Which TCP and UDP ports are required to run an Ethereum client?

The geth CLI options suggest that per default the client listens on TCP port 30303. This page, additionally suggests that UDP port 30301 is used for node discovery. Is this all that is required or ...
12
votes
2answers
1k views

Good iptables rulesets for IPv4 and IPv6 in Geth Ethereum Node

Currently I'm using the following iptables rules for my remote (server) geth node: V4 *filter # Allow all loopback (lo0) traffic and reject traffic # to localhost that does not originate from lo0. -...
11
votes
4answers
452 views

How to determine if ISP is blocking Ethereum traffic

My "Ethereum Wallet" from ethereum.org used to connect to several peers. A while ago I noticed it was taking longer and longer to sync and the number of peers dropped. It got worse, and seldom ...
3
votes
1answer
5k views

Port requirements for a Full-Node?

Do I need to open BOTH TCP and UDP 30303 on my router? Or only TCP? EDIT: I am also unclear if the UDP protocol should be opened on Port 30301 instead (as discussed on this page: https://github.com/...
3
votes
1answer
1k views

DwarfPool mining: Blockchain-syncing and firewall settings

Some questions related to this DwarfPool (ETH) mining command: ethminer -F http://eth-eu.dwarfpool.com/0xb... Is it correct that... ethminer does not download the blockchain, it only creates DAG ...
1
vote
0answers
101 views

Is it necessary to have the UDP port open for an Ethereum private net?

An Ethereum node requires both TCP (listener) and UDP (discovery) port (usually 30303) open and reachable by other nodes. My question: is it possible to run a private network with my node only ...
0
votes
2answers
183 views

Ethereum Node on Azure Virtual Machine (windows) remote access

I've a Windows Server VM on Azure where geth is running quite good (no mining, just node). Now, the "start command" is: geth --rpcapi "eth,web3,db,net,personal,admin" --rpcaddr "10.0.0.4" --port "...
0
votes
1answer
1k views

Geth not synchronizing - Firewall issue?

I am trying to sync an ethereum node on my computer, which is connected to a university network. However it seems that geth is not finding any peers, same thing with mist. It looks to me like the ...
0
votes
1answer
12 views

unable to connect to TestChain by Code

I am new at Ethereum and intended to connect to a test chain by c#. my code runs greatly on my old laptop win7, but on newer one Win10 it just waits forever. this is my code. has anyone any idea? ...