Thank you very much for your response.
I had already done part 1 but it did not work.
I did part 2 and again it did not work.
It is not the problem with antivirus or firewall either.
Of note, I do not know how relevant it is but when I start the program it open very quickly. From my experience with other wallets, it should normally take 1 minute or so to upload the block index.
Anyway, any other solution?