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Ethereum Connection Refused: Troubleshooting Guide

When attempting to connect to the Ethereum network using a WebSockets client such as “curl” in a container running Ubuntu 16.04, you may receive an error message stating that the Ethereum node refused to connect. In this article, we will explore the possible causes of this error and provide steps to resolve it.

Why is the connection refused?

There are several reasons why the connection may be refused:

• Invalid or incomplete credentials: Make sure that the “user” and “pass” variables passed with the “–user” option are valid Ethereum wallet addresses.

• Invalid WebSocket handshake

  

  : The Ethereum node may not be configured to listen for incoming connections on the specified port (default 7687). Verify that the container is up and listening on this port.

• Firewall or network issues: If you are behind a firewall, it may be blocking the connection. Check your firewall configuration to make sure the port is allowed.

• Outdated Ethereum node software: Make sure your Ethereum node software (e.g. ethers.js) is up to date.

Troubleshooting steps

• Verify credentials:

• Double-check the “user” and “pass” variables provided with the “-user” option to make sure they contain valid Ethereum wallet addresses.

• Verify the WebSocket handshake:

• Verify that the container is running and listening on port 7687 by running docker ps -f name=bitecoin-ethereum. If not, start it manually with docker run ....

• Firewall or network issues:

• Check your firewall configuration and make sure port 7687 is allowed.

• Update your Ethereum node software:

• Run “sudo apt update” and install the latest Ethereum node software (e.g. “ethers.js”) with “sudo apt install ethers.js”

• Check your network connectivity:

• Make sure you can connect to your Ethereum node from another terminal or command line.

Usage example

Here is an example of how you can use curl in a container running Ubuntu 16.04 and a web server running Docker.

Create a new user and wallet in Bitcoin Core (BTC)
echo "key = 'your wallet address';" > bitcoin.conf

Start the bitcoin node
sudo systemctl start btcd --no-logfile

Create a new Ethereum wallet address using ethers.js
ethers.js new --wallet-type=eth

Connect to the Ethereum network using curl
curl --user your-username:your-password --data binary '{"jsonrpc":"1.0","method":"eth_getTransactionCount","params":["0x0"

After following these steps and troubleshooting possible issues, you should be able to resolve the “Connection refused” error when using curl in a container running Ubuntu 16.04 and a Docker web server running Ethereum.