OTA: Firmware Over-The-Air update not possible

Hello everyone, I am trying to transfer a new program to an ESP8266-12F using OTA. It tells me that the transfer has started, but I can’t see any progress, even after 30 minutes.
The photos show the message. I use windows 10 .

Of you say OK to that message, what does the update log say?

Pete.

Halle Pete,
the update log dont change anyway when i say OK to that message.

Pete.