I have a brand new Linksys N750 WIFI router. I tested the ports via the ShieldsUp! test at GRC.com and it reported Port 25 (smtp) as "closed" instead of stealth.
I took a look through the the various pages in the router's web based admin interface, and I don't see anything related to Port 25.
How do I get the N750 to be stealth on Port 25 instead of responding to attempted connections as "closed" ?