The connection does not occur as the first time and not even after restoring from backup

[daxxxit]

Hi there,
posted already here, but this post is closed: #643

Hardware:
SUN2000-6KTL-M0 fw: V100R001C00SPC159 (latest)
SDongleA-01 fw: V100R001C00SPC123 (latest)

The issue was closed citing a connection error or unstable connection, but that's not the problem. As a network administrator, I can assure you that the connection is stable and has no issues. In fact, the connection between the server and the inverter has been active for 3 years.
I backed up the old server and restored it onto the new server, everything works perfectly, but the connection with the inverter remains down. I've even tried connecting from a "clean" server, but it won't establish a connection. If I turn on the old server, the connection is immediate and stable. The connection I've been using for 3 years is through the Wi-Fi AP inside the inverter because my dongle doesn't have the 'Modbus-TCP' option.

[Home Assistant 192.168.1.34] --LAN--> [Router 192.168.1.1] --WIFI--> [192.168.1.225 Router OperWRT 192.168.8.2] --WIFI--> [Inverter WiFi AP 192.168.8.1]

From the VM Home Assistant, if I execute the ping:

64 bytes from 192.168.8.1: seq=0 ttl=254 time=6.275 ms
64 bytes from 192.168.8.1: seq=1 ttl=254 time=5.763 ms
64 bytes from 192.168.8.1: seq=2 ttl=254 time=5.994 ms
64 bytes from 192.168.8.1: seq=3 ttl=254 time=6.045 ms
64 bytes from 192.168.8.1: seq=4 ttl=254 time=5.633 ms
64 bytes from 192.168.8.1: seq=5 ttl=254 time=5.200 ms

The port 502 is open, the port 6607 is close.

Nmap scan report for 192.168.8.1
Host is up (0.0059s latency).

PORT    STATE SERVICE
502/tcp open  mbap

Nmap done: 1 IP address (1 host up) scanned in 0.10 seconds

I thought that perhaps an old version of the integration created the connection, with updates it no longer creates a new connection but the existing connection continues to work, but I do not understand why it does not work with the VM created with the full backup from the NUC.

I am not interested in connecting to the dongle’s wifi but I would like to be able to connect to the inverter’s internal AP wifi as it has been so far with the old NUC.

From the pymodbus logs, it seems there is an initial connection, but then there are errors occurring:

2024-03-08 14:52:47.660 DEBUG (MainThread) [pymodbus.logging] Connecting to 192.168.8.1:502.
2024-03-08 14:52:47.660 DEBUG (MainThread) [pymodbus.logging] Connecting comm
2024-03-08 14:52:47.724 DEBUG (MainThread) [pymodbus.logging] Connected to comm
2024-03-08 14:52:47.725 DEBUG (MainThread) [pymodbus.logging] callback_connected called
2024-03-08 14:52:47.861 DEBUG (MainThread) [huawei_solar.modbus] Waiting for 1500 milliseconds after connection before performing operations
2024-03-08 14:52:47.862 INFO (MainThread) [huawei_solar.huawei_solar] Waiting for connection ...
2024-03-08 14:52:48.918 ERROR (MainThread) [homeassistant] Error doing job: Task exception was never retrieved
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 948, in async_init
    flow, result = await task
                   ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 976, in _async_init
    result = await self._async_handle_step(flow, flow.init_step, data)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 501, in _async_handle_step
    result: FlowResult = await getattr(flow, method)(user_input)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/mbapi2020/config_flow.py", line 128, in async_step_reauth
    self._reauth_entry = self.hass.config_entries.async_get_entry(self.context["entry_id"])
                                                                  ~~~~~~~~~~~~^^^^^^^^^^^^
KeyError: 'entry_id'
2024-03-08 14:52:49.635 DEBUG (MainThread) [huawei_solar.huawei_solar] Reading register 43006 with length 1 from slave 0
2024-03-08 14:52:49.636 DEBUG (MainThread) [pymodbus.logging] send: 0x0 0x1 0x0 0x0 0x0 0x6 0x0 0x3 0xa7 0xfe 0x0 0x1
2024-03-08 14:52:49.636 DEBUG (MainThread) [pymodbus.logging] Adding transaction 1
2024-03-08 14:52:59.637 DEBUG (MainThread) [pymodbus.logging] send: 0x0 0x1 0x0 0x0 0x0 0x6 0x0 0x3 0xa7 0xfe 0x0 0x1
2024-03-08 14:52:59.637 DEBUG (MainThread) [pymodbus.logging] Adding transaction 1
2024-03-08 14:53:09.640 DEBUG (MainThread) [pymodbus.logging] send: 0x0 0x1 0x0 0x0 0x0 0x6 0x0 0x3 0xa7 0xfe 0x0 0x1
2024-03-08 14:53:09.640 DEBUG (MainThread) [pymodbus.logging] Adding transaction 1
2024-03-08 14:53:19.641 DEBUG (MainThread) [pymodbus.logging] send: 0x0 0x1 0x0 0x0 0x0 0x6 0x0 0x3 0xa7 0xfe 0x0 0x1
2024-03-08 14:53:19.642 DEBUG (MainThread) [pymodbus.logging] Adding transaction 1
2024-03-08 14:53:29.642 DEBUG (MainThread) [pymodbus.logging] Connection lost comm due to Server not responding
2024-03-08 14:53:29.644 DEBUG (MainThread) [pymodbus.logging] Getting transaction 1
2024-03-08 14:53:29.645 ERROR (MainThread) [huawei_solar.huawei_solar] Aborting client creation due to error.
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/huawei_solar/huawei_solar.py", line 178, in create
    await huawei_solar._initialize()
  File "/usr/local/lib/python3.12/site-packages/huawei_solar/huawei_solar.py", line 107, in _initialize
    self.time_zone = (await self.get(rn.TIME_ZONE)).value
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/huawei_solar/huawei_solar.py", line 241, in get
    return (await self.get_multiple([name], slave))[0]
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/huawei_solar/huawei_solar.py", line 276, in get_multiple
    response = await self._read_registers(registers[0].register, total_length, slave)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/huawei_solar/huawei_solar.py", line 398, in _read_registers
    return await _do_read()
           ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/backoff/_async.py", line 151, in retry
    ret = await target(*args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/backoff/_async.py", line 151, in retry
    ret = await target(*args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/huawei_solar/huawei_solar.py", line 351, in _do_read
    response = await self._client.read_holding_registers(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pymodbus/client/base.py", line 207, in async_execute
    raise ModbusIOException(
pymodbus.exceptions.ModbusIOException: Modbus Error: [Input/Output] ERROR: No response received after 3 retries

Nobody helping me??? Pippo closed my issue without even reading it and saying it's a connection problem, which is definitely not true.
Is nobody helping here either??