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I am trying to forward port 8080 thru my modem but i have not been successful. to be exact my desired route is as follows:

  • Connection to Server A (192.168.0.5) is tested as working (192.168.0.5:8080)
  • Server A (192.168.0.5) forwards thru Linksys router (tested as working (172.16.1.2:8080))
  • Linksys router (172.16.1.2) forwards thru CT5701T (tested as not working (174.34.0.58:8080) while inside subnet, BUT works on the outside)

the NAT routing info for CT5071T is:

Server Name         = Web Server
External Port Start = 8080
External Port End   = 8080
Protocol            = TCP
Internal Port Start = 8080
Internal Port End   = 8080
Server IP Address   = 172.16.1.2

CT5071T was rebooted after make this change.

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  • How are you testing the port forwarding? Are you trying to do it from your computer inside your firewall?
    – smassey
    Mar 11, 2012 at 20:40
  • @smassey just tested from outside of my subnet (via 3G) and is tested as working, which firewall would be causing this to happen?
    – Alex Gittemeier
    Mar 11, 2012 at 20:54
  • Many "SOHO" WAN/LAN routers that implement port forwarding will not forward traffic originating from the "LAN" side.
    – Kyle Smith
    Mar 12, 2012 at 1:00

2 Answers 2

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It might be that your ISP is blocking that port as it's known as a HTTP backup port. You might want to consult with them first.

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  • +1 for the idea but also tried running apache on port 53617 with the same results.
    – Alex Gittemeier
    Mar 11, 2012 at 20:59
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The problem that caused my server to not be seen was that my router is in fact a SOHO router that does not forward ports back into the subnet (Contributors @LucasKauffman @KyleSmith @smassey)

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