[cdr]

Even worse, some will simply arbitrarily silently truncate the password. But not everywhere! The sign up page might silently truncate and then the actual login page might not.

[piyush_soni]

Wow. That would be a wonderful game of treasure hunt. Fortunately I've not come across that so far :D

[_0ffh]

What happened to me once is that a long-time password of mine got truncated as the website lowered it's maximum password length, and the login page didn't truncate, so my full correct password suddenly stopped working. The pain.

[erhaetherth]

Pretty sure Microsoft did this at some point. Maybe for Hotmail.