Anyone else having sudden incoming authentication errors with iCloud mail on Android?

I can send but not receive. I am using the stock Android e-mail client on my S4. Icloud mail has worked fine up until today. Today I cannot authenticate to imap.mail.me.com. I'm being asked for my password, which has not changed. Authentication fails regardless of security type selected, and I even tried also changing the port to 993 when trying TLS or TLS (accept all certificates). System status page says e-mail is in the green.