Problems with firewall when forwarding 8080 thru Comtrend5071T

Question

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.

How are you testing the port forwarding? Are you trying to do it from your computer inside your firewall? — smassey, Mar 11 '12 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 '12 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 '12 at 01:00

score 1 · Answer 1 · answered Mar 11 '12 at 20:33

1

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.

answered Mar 11 '12 at 20:33

Lucas Kauffman

16,880
9
58
93

+1 for the idea but also tried running apache on port 53617 with the same results. – Alex Gittemeier Mar 11 '12 at 20:59

score 1 · Accepted Answer · answered Mar 12 '12 at 04:30

1

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)

answered Mar 12 '12 at 04:30

Alex Gittemeier

121
6

Problems with firewall when forwarding 8080 thru Comtrend5071T

2 Answers2