Favicon problem in Chrome after SSL installation

I have a multisite with theme Responsive since a couple of years. There was no favicon problem until SSL was installed two seaks ago.

The favicon is okey in IE and Firefox but not in Chrome. I can see the favicon in the panel but not on the website.

The cache in Chrome is emptied. I have tried to put
<link rel=”shortcut icon” href=”<?php echo get_stylesheet_directory_uri(); ?>/wp-content/uploads/sites/8/2017/11/favicon.png” />
in the header-php in a child theme without success.

I have also tried jpg-,png-, gif-files with 16×16, 32×32, 512×512 pixels.

But nothing seems to help.

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