I find a lot of websites will eat passwords that contain special characters. I don't mean that they'll tell you it doesn't match the password policy, I mean tha

I find a lot of websites will eat passwords that contain special characters. I don't mean that they'll tell you it doesn't match the password policy, I mean that they'll accept the password and then tell you the password is wrong when you come back to sign in. I eventually had to teach my password generator to use only a few usually-properly-handled special characters when generating to avoid the hassle of having to reset the password every time. The same thing is often true of long passwords -- websites will accept the password at the UI level, but it probably gets truncated somewhere in the processing, and you don't know which character you got cut off at, so you have to reset to something shorter.