I have this setup:
domain.tld - project site;
server.domain.tld - Hestia server;
The problem:
domain.tld has user management system which requires login. When logged in, cookie for user X is set.
Now, I go to server.domain.tld to login to the Hestia control panel. I submit credentials and immediately redirected back to login screen.
Issue resolves when I clear *.domain.tld cookies from browser or use “private browsing”. So far, tested on Firefox. Is this something related to Hestia cookies?