Ethereum RPC Error: Invalid RPC Username or Password

As an Ethereum user, you may have encountered an error message when trying to use the bitcoin-cli command. The error message “invalid rpcuser or rpcpassword (authorization failed)” means that your Ethereum username or password is invalid.

This can be frustrating, especially if you are new to Bitcoin or Ethereum. In this article, we will look at the causes of this error and provide tips on how to resolve it.

Understanding RPC Authentication

Ethereum uses a protocol called Remote Procedure Call (RPC) to communicate with nodes on the network. When you use bitcoin-cli commands, your username and password are sent as an XML string over the RPC connection. The server then verifies this information against the user’s stored credentials.

If the username or password is invalid, the server will reject the authentication request, resulting in the error message “invalid rpcuser or rpcpassword (authorization failed)”.

Troubleshooting Steps

To resolve the issue, do the following:

1. Check your configuration file

Make sure you have created a bitcoin.conf file in the specified directory (/mnt/btc) with the following content:

[ RPC ]
rpcuser = [username]
rpcpassword = [password]

Alternatively, use the "default" key for the RPC username and password
rpcuser = default
rpcpassword = 1234567890abcdef

Replace [username] and [password] with your actual Ethereum username and password.

2. Verify your username and password

Double check that you entered your username and password correctly in the bitcoin.conf file or when running bitcoin-cli. Make sure that your username and password are spelled exactly as they are in the bitcoin.conf file or when you type them into bitcoin-cli.

3. Re-run bitcoind -datadir

Try running bitcoind -datadir=/mnt/btc again to make sure the configuration is loaded correctly.

4. Check your network connection

Make sure you are connected to the Ethereum network with a stable internet connection and VPN (if necessary). If you are behind a proxy or firewall, make sure that it is not blocking bitcoin-cli communication.

5. Update Bitcoin-Qt

If you are using a version of Bitcoin-Qt older than 1.29.0-rc.1, update to the latest version:

git clone 
git checkout 1.29.0-rc.1

Then restart bitcoind:

./bitcoin --datadir=/mnt/btc --force-reload

6. Restart the Bitcoind node

Try to manually restart the Bitcoin node:

bitcoind -force-restart

This will reload the configuration files and restart the node.

Conclusion

If you have followed these steps and are still having problems, there may be other factors at play. You can try:

• Check for bitcoin-cli or bitcoind updates.

• Verify your network connection.

• Manually restart your Bitcoin node.

By following these troubleshooting steps, you should be able to resolve the “invalid rpcuser or rpcpassword (authorization failed)” error when using bitcoin-cli.

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