Provided is a process, including: obtaining a first password to a private computer network; determining, with a credential-monitoring application within the private computer network, whether the first password satisfies one or more criteria by: comparing the first password to a set of compromised credentials within a database within the private computer network; and determining whether the first password matches one or more passwords within the database; and in response to the determination that the first password satisfies the one or more criteria from among the plurality of criteria, causing a use of the first password to access the private computer network to be rejected and causing a first user associated with the first password to be notified to change the first password.