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Security update connectivity
Verify the connectivity between the relay server and its Active Update source or proxy server.
To verify that both a route exists and that the relay port number is open, enter the command:
telnet [relay IP] [port number]
If the telnet fails, verify that a route exists and that firewall policies (if any) allow the traffic by pinging or using traceroute. Also verify that the port number is open, and doesn't have a port conflict.
To verify that the DNS server can resolve the domain name of the relay, enter the command:
nslookup [relay domain name]
If the test fails, verify that the agent is using the correct DNS proxy or server (internal domain names can't be resolved by a public DNS server such as Google or your ISP).
If you are using Workload Security, you might not be using your own relays; instead, you will be using the relays that are built into the service: relay.deepsecurity.trendmicro.com.
If you use a proxy server, on Workload Security, confirm that the proxy settings are correct.
To determine if your Workload Security settings are blocking connectivity, unassign the current policy.