WSL: Failed to establish a new connection: [Errno 111] Connection refused

[praxis-dev]

I'm trying to print out a transaction which is located on 4:00 mark of the YouTube video.

My code:

from turtle import clear
from solcx import compile_standard, install_solc
import json
from web3 import Web3

with open("./SimpleStorage.sol", "r") as file:
    simple_storage_file = file.read()
    # print(simple_storage_file)

    install_solc("0.6.0")
    compiled_sol = compile_standard(
        {
            "language": "Solidity",
            "sources": {"SimpleStorage.sol": {"content": simple_storage_file}},
            "settings": {
                "outputSelection": {
                    "*": {"*": ["abi", "metadata", "evm.bytecode", "evm.sourceMap"]}
                }
            },
        },
        solc_version="0.6.0",
    )
# print(compiled_sol)

with open("compiled_code.json", "w") as file:
    json.dump(compiled_sol, file)

bytecode = compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["evm"][
    "bytecode"
]["object"]

abi = compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["abi"]

# For connection with ganache
w3 = Web3(Web3.HTTPProvider("HTTP://127.0.0.1:7545"))
chain_id = 1337
my_address = "0xCA03a59B6A32C53C24fD54d99D4d32BD60F15D57"
private_key = "0x41f6145069d856a54822d58a000c74f031fb9e7dcebf56205a1c608c9b95402a"

# Create the contract in python
SimpleStorage = w3.eth.contract(abi=abi, bytecode=bytecode)
# Get the latest transaction
nonce = w3.eth.getTransactionCount(my_address)
print(nonce)
# 1. Build a transaction
# 2. Sign a transaction
# 3. Send a transcation
transaction = SimpleStorage.constructor().buildTransaction(
    {
        "chainId": chain_id,
        "gasPrice": w3.eth.gas_price,
        "from": my_address,
        "nonce": nonce,
    }
)
print(transaction)

The error:

(PVEnv) praxis@Praxis:~/demos/web3_py_simplestorage$ python deploy.py
Traceback (most recent call last):
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/connection.py", line 174, in _new_conn
    conn = connection.create_connection(
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/util/connection.py", line 95, in create_connection
    raise err
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/util/connection.py", line 85, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/connectionpool.py", line 703, in urlopen
    httplib_response = self._make_request(
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/connectionpool.py", line 398, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/connection.py", line 239, in request
    super(HTTPConnection, self).request(method, url, body=body, headers=headers)
  File "/usr/lib/python3.8/http/client.py", line 1256, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/lib/python3.8/http/client.py", line 1302, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.8/http/client.py", line 1251, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.8/http/client.py", line 1011, in _send_output
    self.send(msg)
  File "/usr/lib/python3.8/http/client.py", line 951, in send
    self.connect()
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/connection.py", line 205, in connect
    conn = self._new_conn()
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/connection.py", line 186, in _new_conn
    raise NewConnectionError(
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x7f11a45c9fa0>: Failed to establish a new connection: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/requests/adapters.py", line 440, in send
    resp = conn.urlopen(
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/connectionpool.py", line 785, in urlopen
    retries = retries.increment(
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/urllib3/util/retry.py", line 592, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='127.0.0.1', port=7545): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f11a45c9fa0>: Failed to establish a new connection: [Errno 111] Connection refused'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "deploy.py", line 43, in <module>
    nonce = w3.eth.getTransactionCount(my_address)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/module.py", line 57, in caller
    result = w3.manager.request_blocking(method_str,
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/manager.py", line 197, in request_blocking
    response = self._make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/manager.py", line 150, in _make_request
    return request_func(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/middleware/formatting.py", line 94, in middleware
    response = make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/middleware/gas_price_strategy.py", line 90, in middleware
    return make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/middleware/formatting.py", line 94, in middleware
    response = make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/middleware/attrdict.py", line 33, in middleware
    response = make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/middleware/formatting.py", line 94, in middleware
    response = make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/middleware/formatting.py", line 94, in middleware
    response = make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/middleware/formatting.py", line 94, in middleware
    response = make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/middleware/buffered_gas_estimate.py", line 40, in middleware
    return make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/middleware/exception_retry_request.py", line 105, in middleware
    return make_request(method, params)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/providers/rpc.py", line 88, in make_request
    raw_response = make_post_request(
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/web3/_utils/request.py", line 102, in make_post_request
    response = session.post(endpoint_uri, data=data, *args, **kwargs)  # type: ignore
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/requests/sessions.py", line 577, in post
    return self.request('POST', url, data=data, json=json, **kwargs)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/requests/sessions.py", line 529, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/requests/sessions.py", line 645, in send
    r = adapter.send(request, **kwargs)
  File "/home/praxis/demos/web3_py_simplestorage/PVEnv/lib/python3.8/site-packages/requests/adapters.py", line 519, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=7545): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f11a45c9fa0>: Failed to establish a new connection: [Errno 111] Connection refused'))

I've spent some time trying to figure it out already. Some discussion says that it can be linked to activity of an antivirus of a firewall. Test with paused protection returned the same results.

Any suggestions?

[praxis-dev]

I've figured out that the problem might be with ganache.

(PVEnv) praxis@Praxis:~/demos/web3_py_simplestorage$ ganache --version
This version of µWS is not compatible with your Node.js build:

Error: Cannot find module './uws_linux_x64_108.node'
Falling back to a NodeJS implementation; performance may be degraded.


ganache v7.1.0 (@ganache/cli: 0.2.0, @ganache/core: 0.2.0)

[praxis-dev]

Problem is solved. If you are a WSL user, make sure that Ganache is up and running in the WSL by typing in terminal

ganache-cli

Once it is launched use Chain Id and RPC Listening on:..... in your code of deploy.py

[cromewar]

Sorry for the delay, I'm glad is solved now.