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Solved
Netgear R6400v2 firewall query
When I scan two specific ports from outside my home they show as blocked. nmap -Pn -T4 -p 25,9000 "IP address" Starting Nmap 6.40 ( http://nmap.org ) at 2022-01-03 16:54 UTC Nmap scan report fo...
I managed to get port forwarding working.
Part of the problem was that TCP Wrappers (aka tcpd) was blocking one port that was making it through the the Netgear router. That's solved now.
But, Comcast blocks the old SMTP email port 25, so that data never reaches the Netgear router. Here's what they say about that https://www.xfinity.com/support/articles/email-port-25-no-longer-supported I tend to agree with them, but it sure is inconvenient. That's the price I pay for security.
Hi KevinC123, we'd like to know the following:
1. What firmware version is the R6400v2?
2. Have you tried port forwarding for the said ports?
3. Do you have UPnP enabled or disabled?
Dexter
I managed to get port forwarding working.
Part of the problem was that TCP Wrappers (aka tcpd) was blocking one port that was making it through the the Netgear router. That's solved now.
But, Comcast blocks the old SMTP email port 25, so that data never reaches the Netgear router. Here's what they say about that https://www.xfinity.com/support/articles/email-port-25-no-longer-supported I tend to agree with them, but it sure is inconvenient. That's the price I pay for security.