For unknown reasons, the management password for a switch I set up is not in my password manager, and all the standard default passwords ("password", "admin", "", "4"*) are being rejected. I will have to factory reset it.
* I would have set this password before "4" joined this list, but I thought I'd try anyway.
@futzle did you try "the standard password but with caps lock on" because I've done that to myself more than once. 🙃