.Test Razor port (tcp port 2703):
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-# nmap -P0 -sS -p 2703 c301.cloudmark.com
+# nmap -Pn -sS -p 2703 c301.cloudmark.com
Starting Nmap 7.70 ( https://nmap.org ) at 2020-04-14 12:20 CEST
Nmap scan report for c301.cloudmark.com (208.83.137.114)
Host is up (0.13s latency).