Allow outbound TCP port 2001 (default Host API port) to the KMES Series 3, specified by FQDN (for example, kmes.example.com) or CIDR (for example, 10.0.0.0/24).
TLS inspection or SSL proxies can break mutual TLS handshakes. Exempt the KMES FQDN(s) from inspection. Configure the KMES Series 3 with an FQDN so the exemption applies.