In the lesson 6 and the lesson 7, when verifying the contract, a connection timeout error occurred.

[Dear-MrHe]

Whenever I verify the contract on the test network, such as running the command yarn hardhat deploy --network sepolia, the following connection timeout error occurs.

Verifying contract...
ConnectTimeoutError: Connect Timeout Error
    at onConnectTimeout (/home/lenovo/hh-fcc/hardhat-fund-me-fcc/node_modules/@nomiclabs/hardhat-etherscan/node_modules/undici/lib/core/connect.js:182:24)
    at /home/lenovo/hh-fcc/hardhat-fund-me-fcc/node_modules/@nomiclabs/hardhat-etherscan/node_modules/undici/lib/core/connect.js:129:46
    at Immediate._onImmediate (/home/lenovo/hh-fcc/hardhat-fund-me-fcc/node_modules/@nomiclabs/hardhat-etherscan/node_modules/undici/lib/core/connect.js:170:9)
    at processImmediate (node:internal/timers:466:21) {
  code: 'UND_ERR_CONNECT_TIMEOUT'
}

[aaankeet]

@Dear-MrHe Network issue I guess. well, you can verify directly on Etherscan.

[alfaqi]

@Dear-MrHe Make sure the hardhat.config.js is correct, (especially the endpoint) like this:

const SEPOLIA_RPC_URL =  
process.env.SEPOLIA_RPC_URL || "https://eth-sepolia.g.alchemy.com/v2/your-api-key"
const PRIVATE_KEY = process.env.PRIVATE_KEY 
  networks: {
    sepolia: {
      url: SEPOLIA_RPC_URL,
      accounts: [PRIVATE_KEY],
      chainId: 11155111,
    },

[Dear-MrHe]

This part of my hardhat.config.js is below and should be fine.

const SEPOLIA_RPC_URL = process.env.SEPOLIA_RPC_URL || "https://eth-sepolia"
const PRIVATE_KEY = process.env.PRIVATE_KEY || "0xkey"
networks: {
        sepolia: {
            url: SEPOLIA_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 11155111,
            blockConfirmations: 6,
        },
},

[alfaqi]

is SEPOLIA_RPC_URL in .env file like this
SEPOLIA_RPC_URL=https://eth-sepolia.g.alchemy.com/v2/your-api-key

[Dear-MrHe]

Yes.

[alfaqi]

Can you share your project repo