PSA: If you can't login to qBittorrent (pass: adminadmin) check the container log .

For anyone hosting qbittorrent container on their NAS. This is added in a new update or something. If qBittorrent detects a password was not set, instead of allowing you to login using the default password: adminadmin. it will produce a random password, you can find it in the container log.

The message should be:

"The WebUI administrator password was not set. A temporary password is provided for this session: _your_password_here_"

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EDIT: Change made in qbittorrent 4.6.1 changelog

"WEBUI: Drop WebUI default credentials (glassez)"

EDIT2: Apparently its having trouble spitting out the passwords, so if you don't see it, probably have to wait for a fix.