It turns out that my caring ISP really has a free firewall service
which is enabled by default.
I asked my ISP to disable it completely and now everything is OK.
Thank you!

29.11.2020 14:30, Stuart Henderson пишет:
On 2020-11-29, Stuart Henderson <s...@spacehopper.org> wrote:
On 2020-11-29, Родин Максим <a23s4a2...@yandex.ru> wrote:
The problem is that only port 80 seems to be open from the outside.
I used several online port scanners to check this.
All of them tell:
port 80 OPEN
port 443 CLOSED

Could it be blocked by your ISP? Do you receive packets on your external
interface at all when you test port 443?




Or...if this is behind nat, do you need to add a port-forwarding on your ISP 
router?


--
С уважением,
Родин Максим

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