MetaMask failed to add a network: How to manually configure RPC?

Manually configure RPC in MetaMask to add custom networks: enter correct URL, chain ID, and currency symbol to avoid "failed to add network" errors.

May 14, 2025 at 06:43 pm

Introduction to MetaMask and RPC Configuration

MetaMask is a popular cryptocurrency wallet that allows users to interact with the Ethereum blockchain and other compatible networks. One of the essential features of MetaMask is the ability to add custom networks, which can be done through the use of Remote Procedure Call (RPC). However, users sometimes encounter issues when trying to add a network, resulting in the error message "MetaMask failed to add a network." In such cases, manual configuration of the RPC becomes necessary. This article will guide you through the process of manually configuring an RPC in MetaMask to successfully add a custom network.

Understanding RPC and Its Importance

Remote Procedure Call (RPC) is a protocol that allows a program to request a service from a program located on another computer in a network without understanding the network's details. In the context of blockchain, RPC is used to communicate with nodes on the network, enabling users to interact with the blockchain. RPC is crucial for adding custom networks to MetaMask because it provides the necessary connection details to access the network.

Common Reasons for MetaMask Network Addition Failure

There are several reasons why MetaMask might fail to add a network. Some of the most common include:

• Incorrect RPC URL: If the RPC URL provided is incorrect or outdated, MetaMask will not be able to connect to the network.
• Network Congestion: High traffic on the network can prevent MetaMask from establishing a connection.
• Firewall or Security Settings: Certain security settings on your device or network might block the connection to the RPC server.
• Outdated MetaMask Version: Using an outdated version of MetaMask can lead to compatibility issues with new networks.

Preparing for Manual RPC Configuration

Before you begin the manual configuration process, ensure that you have the following information ready:

• Network Name: The name of the network you want to add.
• New RPC URL: The correct RPC URL for the network.
• Chain ID: The unique identifier for the network.
• Currency Symbol: The symbol used for the network's native cryptocurrency.
• Block Explorer URL: The URL of the block explorer for the network (optional but recommended).

Step-by-Step Guide to Manually Configuring RPC in MetaMask

To manually configure an RPC in MetaMask, follow these detailed steps:

• Open MetaMask: Launch the MetaMask extension or mobile app and ensure you are logged into your account.
• Access Settings: Click on the three dots in the top right corner of the MetaMask interface and select "Settings."
• Navigate to Networks: In the settings menu, click on "Networks."
• Add New Network: Click on "Add Network" to start the process of adding a new network.
• Enter Network Details: Fill in the following fields with the information you prepared earlier:
  • Network Name: Enter the name of the network.
  • New RPC URL: Enter the correct RPC URL for the network.
  • Chain ID: Enter the chain ID for the network.
  • Currency Symbol: Enter the symbol used for the network's native cryptocurrency.
  • Block Explorer URL: Enter the URL of the block explorer for the network (if available).
• Save Network: After entering all the required information, click "Save" to add the network to MetaMask.

Troubleshooting Common Issues During Manual Configuration

If you encounter issues during the manual configuration process, consider the following troubleshooting steps:

• Double-Check RPC URL: Ensure that the RPC URL you entered is correct and up-to-date. You can verify this by checking the network's official documentation or community forums.
• Check Network Status: Verify that the network you are trying to add is operational and not experiencing any downtime or congestion.
• Update MetaMask: Ensure that you are using the latest version of MetaMask. You can check for updates in the extension or app store where you installed MetaMask.
• Adjust Security Settings: If you suspect that your firewall or security settings are blocking the connection, temporarily disable them to see if it resolves the issue.

Verifying the Added Network in MetaMask

After successfully adding the network, it's important to verify that it is working correctly. Follow these steps to ensure the network is properly configured:

• Switch to the New Network: In the MetaMask interface, click on the network dropdown menu and select the newly added network.
• Check Account Balance: Verify that your account balance is displayed correctly on the new network.
• Send a Test Transaction: Send a small test transaction to another address on the network to ensure that transactions are being processed correctly.
• Use a DApp: Try using a decentralized application (DApp) that is compatible with the new network to ensure that you can interact with it successfully.

Frequently Asked Questions

Q: Can I add multiple custom networks to MetaMask using the same method?

A: Yes, you can add multiple custom networks to MetaMask by following the same manual configuration process for each network. Ensure that you have the correct RPC URL, chain ID, and other details for each network you want to add.

Q: What should I do if the network I added disappears from MetaMask?

A: If the network you added disappears from MetaMask, it could be due to a temporary glitch or an issue with the RPC server. Try re-adding the network using the manual configuration method. If the problem persists, check the network's official channels for any reported issues.

Q: Is it safe to use custom networks in MetaMask?

A: Using custom networks in MetaMask can be safe as long as you are connecting to reputable and verified networks. Always ensure that the RPC URL and other details you use are from trusted sources to avoid potential security risks.

Q: Can I use the same RPC URL for different networks?

A: No, each network has its own unique RPC URL. Using the wrong RPC URL will result in connection issues and prevent you from interacting with the intended network. Always use the correct RPC URL for the specific network you are trying to add.