An administrator is no longer receiving alerting messages from the web server platform that recently failed over to a new secondary datacenter due to a power failure. Which of the following is the cau

Port 21 (FTP) inbound at the primary datacenter is irrelevant because the server has already failed over to the secondary and inbound FTP does not affect outbound alert delivery.

Port 22 (SSH) is commonly used for secure log forwarding agents such as rsyslog over SSH or proprietary monitoring agents that ship alert data to a centralized log server. If the secondary datacenter firewall does not have an outbound rule permitting port 22 to the log server - a rule that existed at the primary - the web server silently fails to deliver alerts after failover. This is a classic DR misconfiguration where network policy is not replicated alongside the workload.

Port 162 (SNMP trap) blocked inbound in the DMZ would prevent a management station inside the DMZ from receiving traps, but does not explain why outbound alerting from the web server fails.

Port 162 outbound blocked in the DMZ would affect SNMP trap delivery, but the scenario specifies a log server as the alerting destination, pointing to an SSH-based forwarding path rather than SNMP.