Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
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|Exchange 2003 Sonicwall NSA 3500 with Anti-Spam enabled - inbound large emails long time to deliver||5||237|
|Cisco ASA 5505 with Verizon Fios||10||213|
|Configuring a /30 IP block and a /26 IP block||6||197|
|Internet link load balancer||6||118|
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