Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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 ( is tested as working (
  • Server A ( forwards thru Linksys router (tested as working (
  • Linksys router ( forwards thru CT5701T (tested as not working ( 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   =    

CT5071T was rebooted after make this change.

share|improve this question
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 1:00

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.

share|improve this answer
+1 for the idea but also tried running apache on port 53617 with the same results. – Alex Gittemeier Mar 11 '12 at 20:59
up vote 1 down vote accepted

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)

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.