Email logins fail with "Invalid password in passdb: crypt() failed: Invalid argument"

Symptoms

Users cannot log in to their mail clients, and webmail is timing out with an error like the following.

CONFIG_TEXT: Invalid password in passdb: crypt() failed: Invalid argument

Cause

This can be caused by license issues on the server. The license needs to be validated and activated in order for email logins to authenticate.

Resolution

The license issue will need to be resolved. The following command can be run to attempt a license update.

# /usr/local/cpanel/cpkeyclt
Updating cPanel license...Done. Update succeeded.

If errors are encountered, they will need to be resolved, and the license update attempted again.