Requests library does not work on deployed app

I have created app that calls several APIs in sequence. When I ran the app on my computer through the Streamlit CMD, it was working fine. However, after deploying the app through Streamlit service, it did not run and gave a runtime error. Keep in mind I did not upload anyu environment file to my GitHub repo because when I tried to do that, the app did not load at all.

Here is the error from the log:

2023-03-28 13:06:16.074 Uncaught app exception
Traceback (most recent call last):
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connection.py", line 174, in _new_conn
    conn = connection.create_connection(
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/util/connection.py", line 95, in create_connection
    raise err
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/util/connection.py", line 85, in create_connection
    sock.connect(sa)
TimeoutError: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connectionpool.py", line 703, in urlopen
    httplib_response = self._make_request(
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connectionpool.py", line 398, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connection.py", line 244, in request
    super(HTTPConnection, self).request(method, url, body=body, headers=headers)
  File "/usr/local/lib/python3.9/http/client.py", line 1285, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/local/lib/python3.9/http/client.py", line 1331, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.9/http/client.py", line 1280, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.9/http/client.py", line 1040, in _send_output
    self.send(msg)
  File "/usr/local/lib/python3.9/http/client.py", line 980, in send
    self.connect()
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connection.py", line 205, in connect
    conn = self._new_conn()
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connection.py", line 186, in _new_conn
    raise NewConnectionError(
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x7fd155d24430>: Failed to establish a new connection: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/adapters.py", line 489, in send
    resp = conn.urlopen(
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connectionpool.py", line 787, in urlopen
    retries = retries.increment(
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/util/retry.py", line 592, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='10.159.84.8', port=2525): Max retries exceeded with url: /PreProcessingUploadRescale (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fd155d24430>: Failed to establish a new connection: [Errno 110] Connection timed out'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/appuser/venv/lib/python3.9/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 565, in _run_script
    exec(code, module.__dict__)
  File "/app/abaqusstreamlit/Main_Page.py", line 100, in <module>
    resp = requests.post(url = api, data = req_data, files = InpZip).json()
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/api.py", line 115, in post
    return request("post", url, data=data, json=json, **kwargs)
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/api.py", line 59, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/sessions.py", line 587, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/sessions.py", line 701, in send
    r = adapter.send(request, **kwargs)
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/adapters.py", line 565, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='XXXX', port=2525): Max retries exceeded with url: /XXXX(Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fd155d24430>: Failed to establish a new connection: [Errno 110] Connection timed out'))
2023-03-28 13:22:06.346 Uncaught app exception
Traceback (most recent call last):
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connection.py", line 174, in _new_conn
    conn = connection.create_connection(
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/util/connection.py", line 95, in create_connection
    raise err
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/util/connection.py", line 85, in create_connection
    sock.connect(sa)
TimeoutError: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connectionpool.py", line 703, in urlopen
    httplib_response = self._make_request(
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connectionpool.py", line 398, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connection.py", line 244, in request
    super(HTTPConnection, self).request(method, url, body=body, headers=headers)
  File "/usr/local/lib/python3.9/http/client.py", line 1285, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/local/lib/python3.9/http/client.py", line 1331, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.9/http/client.py", line 1280, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.9/http/client.py", line 1040, in _send_output
    self.send(msg)
  File "/usr/local/lib/python3.9/http/client.py", line 980, in send
    self.connect()
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connection.py", line 205, in connect
    conn = self._new_conn()
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connection.py", line 186, in _new_conn
    raise NewConnectionError(
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x7fd155d24520>: Failed to establish a new connection: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/adapters.py", line 489, in send
    resp = conn.urlopen(
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/connectionpool.py", line 787, in urlopen
    retries = retries.increment(
  File "/home/appuser/venv/lib/python3.9/site-packages/urllib3/util/retry.py", line 592, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='XXXX', port=2525): Max retries exceeded with url: /XXXX(Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fd155d24520>: Failed to establish a new connection: [Errno 110] Connection timed out'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/appuser/venv/lib/python3.9/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 565, in _run_script
    exec(code, module.__dict__)
  File "/app/abaqusstreamlit/Main_Page.py", line 100, in <module>
    resp = requests.post(url = api, data = req_data, files = InpZip).json()
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/api.py", line 115, in post
    return request("post", url, data=data, json=json, **kwargs)
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/api.py", line 59, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/sessions.py", line 587, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/sessions.py", line 701, in send
    r = adapter.send(request, **kwargs)
  File "/home/appuser/venv/lib/python3.9/site-packages/requests/adapters.py", line 565, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='XXXX', port=2525): Max retries exceeded with url: /XXX (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fd155d24520>: Failed to establish a new connection: [Errno 110] Connection timed out'))

Your host is probably not reachable from the outside world or it is (geo-)blocked.
If i ping the host ip address, i get no answer.

You are right Franky!