Greetings and salutations

I am very close to start sending out links to users for my gallery. But one thing seems to stop me in my tracks.

When I go to the URL mjala211.se/piwigo I do get the login page. But when I enter the username and password I am greeted with

"Cookies are blocked or not supported by your browser. You must enable cookies to log in."

This does confuse me because I am not blocking any cookies.
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More info about the setup:

the domain mjala211.se is a domain I am redirecting to my ddns service at levoidddns.synology.me . Piwigo is installed in a subfolder to the root which is why I add the /piwigo to get access.

The thing is, when I do skip that .se domain and open levoidddns.synology.me/piwigo I can log in with no problems.

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Googling around I have found clues that it can be an issue with how the cookies are created. So my suspicion is that the cookies are created for "levoidddns.synology.me/piwigo" but when the browser is asked about the cookies it is looking for cookies for "mjala211.se/piwigo". So the browser says it doesn't have any... and piwigo then assumes that the browser has disabled cookies because Piwigo is sure they should be there otherwise.

The logic checks out in my head. But I am not sure how to verify my theory.
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So... in short. Am I correct in my diagnosis? And how can I rectify this so that the cookies are created for the right URL?

As a bonus, Can I make the cookies aware what the URL is supposed to be, so I can use both of the URL's when needed?



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The usual piwigo environment data:

Piwigo 11.5.0 Check for upgrade
Operating system: Linux
PHP: 7.4.9 (Show info) [2021-07-28 18:42:58]
MySQL: 5.5.5-10.3.27-MariaDB [2021-07-28 18:42:58]
Graphics Library: ImageMagick 6.9.11-22

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Piwigo URL: http://mjala211.se/piwigo