Arduino IDE 1.8.13 on Windows 10, does not show up OTA ports

Hi,my Arduino IDE 1.8.13 on Windows 10, does frequently not show up OTA ports.
When it does not, the cyan bottom status line displays:

I get “Error on” which is my last used OTA target.

I get this irrespective of that device connected or not.
When the device is connected it works in the WiFI network and can be pinged. Sometimes the IDE works, frequently not.

How can I get more information oh which error it is and try to fix it?

Thank you for any hint.

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