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Ethereum Connection Rejected: Troubleshooting Guide

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

Why is the connection refused?

There are several reasons why a connection may be rejected:

• Incorrect or incomplete credentials: Make sure that the “user” and “pass” variables passed in the “–user” option contain valid Ethereum wallet addresses.

• Incorrect WebSocket handshake: The Ethereum node may not be configured to listen for incoming connections on the specified port (7687 by default). Make sure that the container is running and listening on this port.

• Firewall or network issues

  : If you are behind a firewall, it may be blocking the connection. Check your firewall settings 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• Outdated Ethereum node software: Make sure your Ethereum node software (e.g. “ethers.js”) is up to date.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

• Confirm your login information:

• Check the “user” and “pass” variables passed in the “–user” option to make sure they contain valid Ethereum wallet addresses.

• Verify WebSocket handshake:

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

• Runsudo apt updateand install the latest Ethereum node software (e.g.ethers.js) with the commandsudo apt install ethers.js

Here is an example of how you can use thecurl` command in a container running Ubuntu 16.04 and a web server running Docker:

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

Start a Bitcoin node
sudo systemctl start btcd --no-logfile

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

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

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

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