Talos docs

host_rejected

Since 0.7

403: the Host header does not name this server by a loopback name (DNS rebinding, or a client that set Host)

Plain text
Severityerror

Meaning

403: the Host header does not name this server by a loopback name (DNS rebinding, or a client that set Host)

Fix

address it as 127.0.0.1:<port> or localhost:<port>