This happens when the certificate used to secure the connection to the Symantec Endpoint Protection Manager (SEPM) is not trusted by the Web browser. If the certificate is considered invalid, the browser will warn the user, or block access to the site depending on individual browser configurations.
The default certificate used by the manager is not trusted. It is self-signed against the manager's Fully Qualified Domain Name (FQDN). The NETBIOS name, and the IP addresses assigned to each Network Interface Card (NIC) on the computer are included as Subject Alternative Name (SAN) entries on the certificate as well. The certificate does not include SAN entries for localhost, or 127.0.0.1.
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