brownie.exceptions.RPCRequestError: Web3 is not connected

Question

I am trying to deploy a helloWorld.sol using brownie. I am getting below error when I tried to run brownie run scripts/deploy.py.

Terminating local RPC client... Exception in thread Thread-5: Traceback (most recent call last): File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\connection.py", line 175, in _new_conn (self._dns_host, self.port), self.timeout, **extra_kw File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\util\connection.py", line 96, in create_connection
raise err File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\util\connection.py", line 86, in create_connection
sock.connect(sa) ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\connectionpool.py", line 706, in urlopen chunked=chunked, File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\connectionpool.py", line 394, in _make_request conn.request(method, url, **httplib_request_kw) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\connection.py", line 239, in request super(HTTPConnection, self).request(method, url, body=body, headers=headers) File "C:\Program Files\Python37\lib\http\client.py", line 1229, in request self._send_request(method, url, body, headers, encode_chunked) File "C:\Program Files\Python37\lib\http\client.py", line 1275, in _send_request self.endheaders(body, encode_chunked=encode_chunked) File "C:\Program Files\Python37\lib\http\client.py", line 1224, in endheaders self._send_output(message_body, encode_chunked=encode_chunked) File "C:\Program Files\Python37\lib\http\client.py", line 1016, in _send_output self.send(msg) File "C:\Program Files\Python37\lib\http\client.py", line 956, in send self.connect() File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\connection.py", line 205, in connect conn = self._new_conn() File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\connection.py", line 187, in _new_conn self, "Failed to establish a new connection: %s" % e urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x0000021DAA2A0F28>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\requests\adapters.py", line 449, in send timeout=timeout File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\connectionpool.py", line 756, in urlopen method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2] File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\urllib3\util\retry.py", line 574, in increment raise MaxRetryError(_pool, url, error or ResponseError(cause)) urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='127.0.0.1', port=8545): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x0000021DAA2A0F28>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\brownie\network\rpc\ganache.py", line 82, in _request response = web3.provider.make_request(method, args) # type: ignore File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\web3\providers\rpc.py", line 91, in make_request **self.get_request_kwargs() File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\web3_utils\request.py", line 48, in make_post_request response = session.post(endpoint_uri, data=data, *args, **kwargs) # type: ignore File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\requests\sessions.py", line 590, in post return self.request('POST', url, data=data, json=json, **kwargs) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\requests\sessions.py", line 542, in request resp = self.send(prep, **send_kwargs) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\requests\sessions.py", line 655, in send r = adapter.send(request, **kwargs) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\requests\adapters.py", line 516, in send raise ConnectionError(e, request=request) requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=8545): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x0000021DAA2A0F28>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "C:\Program Files\Python37\lib\threading.py", line 917, in _bootstrap_inner self.run() File "C:\Program Files\Python37\lib\threading.py", line 865, in run self._target(*self._args, **self._kwargs) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\brownie\network\state.py", line 332, in add_to_undo_buffer
self.sleep(0) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\brownie\network\state.py", line 375, in sleep self.time_offset = int(rpc.Rpc().sleep(seconds)) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\brownie\network\rpc_init.py", line 45, in wrapped return fn(*args, **kwargs) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\brownie\network\rpc_init.py", line 166, in sleep return self.backend.sleep(seconds) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\brownie\network\rpc\ganache.py", line 91, in sleep return _request("evm_increaseTime", [seconds]) File "C:\Users\mmasn.local\pipx\venvs\eth-brownie\lib\site-packages\brownie\network\rpc\ganache.py", line 86, in _request raise RPCRequestError("Web3 is not connected.") brownie.exceptions.RPCRequestError: Web3 is not connected.

My deploy.py code is below.

from brownie import accounts, HelloWorld


def deployHelloWorld():
    account = accounts[0]
    helloWorldObject = HelloWorld.deploy({"from": account})
    helloWorldObject.setName("Michael", {"from": account})
    greeting = helloWorldObject.sayHello()
    print(greeting)


def main():
    deployHelloWorld()

could you please help?

Answer 1

This error is caused because there is no waiting after transaction. By using transaction.wait(1), as below, the problem is fixed.

transaction = helloWorldObject.setName("Michael", {"from": account})
    transaction.wait(1)
    greeting = helloWorldObject.sayHello()
    print(greeting)

Answer 2

RPC is sometimes killed too quick, resulting in brownie.exceptions.RPCRequestError: Web3 is not connected. Therefore you have to add the time.sleep(1) after every transaction to ensure your code runs smoothly.