Where is the error: telegram client for hosting?

Question

Python

Hey! Help a beginner.
I registered my client in the "API telegram client", wrote a simple code in python + Telethon.

from telethon.sync import TelegramClient
from telethon.sessions import StringSession
from settings import (API_ID, API_HASH, SESSION_STRING)

client = TelegramClient(StringSession(SESSION_STRING), API_ID, API_HASH)

client.start()

o_sebe=client.get_me().stringify()

f=open('mess_from_teleg.txt', 'a') # сначала откроем файл на запись
f.write(o_sebe)
f.flush()  
f.close() # закроем файл после записи

settings.py - it contains API_ID, API_HASH, SESSION_STRING

I checked the script on the computer: it works. I wanted to host PythonAnywhere and Heroku. Accounts are free. Here and there the script does not work.
Here are the logs after running the script:

PythonAnywhere

I run the script and see the following in the console:

Attempt 1 at connecting failed: ConnectionRefusedError: [Errno 111] Connect call failed ('149.154.167.51', 443)
Attempt 2 at connecting failed: ConnectionRefusedError: [Errno 111 ] Connect call failed ('149.154.167.51', 443)
Attempt 3 at connecting failed: ConnectionRefusedError: [Errno 111] Connect call failed ('149.154.167.51', 443)
Attempt 4 at connecting failed: ConnectionRefusedError: [Errno 111] Connect call failed ('149.154.167.51', 443)
Attempt 5 at connecting failed: ConnectionRefusedError: [Errno 111] Connect call failed ('149.154.167.51', 443)
Attempt 6 at connecting failed: ConnectionRefusedError: [Errno 111] Connect call failed ('149.154.167.51', 443)
Traceback (most recent call last):
File "/home/daralt/proba6Telethon.py", line 7, in
client.start( )
File "/home/daralt/.local/lib/python3.9/site-packages/telethon/client/auth.py", line 133, in start
else self.loop.run_until_complete(coro)
File "/usr/local /lib/python3.9/asyncio/base_events.py", line 642, in run_until_complete
return future.result()
File "/home/daralt/.local/lib/python3.9/site-packages/telethon/client/auth.py", line 140, in _start
await self.connect()
File "/home/daralt/.local/ lib/python3.9/site-packages/telethon/client/telegrambaseclient.py", line 513, in connect
if not await self._sender.connect(self._connection(
File "/home/daralt/.local/lib/python3 .9/site-packages/telethon/network/mtprotosender.py", line 127, in connect
await self._connect()
File "/home/daralt/.local/lib/python3.9/site-packages/telethon/network /mtprotosender.py", line 253, in _connect
raise ConnectionError('Connection to Telegram failed {} time(s)'.format(self._retries))
ConnectionError:Connection to Telegram failed 5 time(s)

Heroku

After starting, I see the following in the console:
2021-10-21T03:39:23.922724+00:00 app[api]: Scaled to [email protected]:Free by user [email protected]
2021-10-21T03:39:26.879709+00 :00 heroku[worker.1]: Starting process with command `
python
proba6Telethon.py` :39:28.800805+00:00 heroku[worker.1]: Process exited with status 0
2021-10-21T03:39:28.871737+00:00 heroku[worker.1]: State changed from up to crashed
2021-10- 21T03:39:28.875439+00:00 heroku[worker.1]: State changed from crashed to
starting py`
2021-10-21T03:39:32.267858+00:00 heroku[worker.1]: State changed from starting to
up 0
2021-10-21T03:39:33.356311+00:00 heroku[worker.1]: State changed from up to crashed

Can you tell me what is wrong?
Thank you.