Tetra-WebBBS Support Forum
Not a cookie issue but a problem caused my mismatching character types.
The software itself just reads and writes (to cookies or whatever) what is sent by the browser. This is regardless to what characterset is sent.
However, the browser may or may not use the correct characterset you want it to use.
Unless the server sends a characterset itself which mismatches the one in the meta tag (not the case on your server) then the browser may prefer it's own setting (e.g. "autodetect" whatever characterset) and display it ... AND use it for the next transmission ... which then of course writes wrong characters to the cookie.
This is always an issue on browser side. Browsers may or may not accept the characterset which is advised by server (with HTTP header) or anywhere in the document.
You can check it out very easily by loading your forum (on a page with German characters), then switch the character encoding via "Ansicht - Zeichenkodierung" (which reloads the page) and see what you get. .... and, even worse, browsers tend to keep some setting and prefer them, esp. if you set it to autodetect.
... Bottomline ... that issue is beyond our control on server/application side, it's the client/browser .... which of course your user will deny