Manual:$wgCookiePath/cs

Podrobnosti
Pokud nechcete, aby vaše přihlášení bylo trvalé na Wikis běžících na stejném serveru a všechny vaše instalace používají stejnou databázi, budete muset upravit soubor

Where  is the directory for that MediaWiki installation relative to the DOCUMENT_ROOT.

This resolves issues where a user is occasionally prompted to log in when viewing a different installation, even though they logged in earlier and asked to have their password remembered.

and provide alternate solutions.