Why when checking Sitemap says network unavailable?

Moved the site to https. Add webmaster Google Sitemap https://www.megaomm.ru/sitemap.xml And it says network not available ... Why? Like file download.
March 19th 20 at 08:30
1 answer
March 19th 20 at 08:32
This is possible if Sitemap a very long time connected. Maybe you should break it into blocks.

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