Which situation is recorded as a system log?

A dropped connection with an authentication server is an event directly related to the firewall's operational status and its ability to perform its functions, thus it is recorded as a system log. System logs track firewall-specific events like service failures, configuration changes, or hardware issues.

A file analyzed as potentially dangerous is typically recorded in a Threat log, specifically for anti-malware or WildFire analysis, which focuses on security events related to content.

An attempt to access a spoofed website being blocked would be recorded in a URL Filtering log or a Threat log, as it relates to content filtering and security enforcement against external threats.

The discovery of a new asset on the network is usually related to asset management or vulnerability scanning features and would typically generate a dedicated asset or vulnerability log, not a general system log.