Zmprov
If you're seeing an error like this when you run zmprov:
[] ERROR: java.security.cert.CertificateExpiredException: NotAfter: Sun Oct 08 00:38:45 EDT 2006 ERROR: zclient.IO_ERROR (invoke java.security.cert.CertificateException: Untrusted Server Certificate Chain, server: localhost) (cause: javax.net.ssl.SSLHandshakeException java.security.cert.CertificateException: Untrusted Server Certificate Chain)
your certs are expired, and need to be recreated