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Thread: Web Interface won't work outside NAT

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  1. #1
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    Default Web Interface won't work outside NAT

    I've got a server setup on FC5 running the latest version as of 4/28/07. It sits behind a Netgear SPI firewall router (SPI is turned off) with split DNS configured. Everything works perfectly on the local LAN and e-mails are successfully sent and received from outside servers. The only problem is that when I try to access the web interface for checking mail outside my LAN, I get no response from the server. I have port forwarding turned on for ports 80, 443, and 25 (all TCP and UDP). I seem to be able to telnet to port 80 on the server, but I can't get the web page to come up. Any suggestions?

  2. #2
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    Default tcpdump

    Have you tried running tcpdump on the server to see if the requests actually make through your firewall to to server?

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    Quote Originally Posted by imarks001 View Post
    Have you tried running tcpdump on the server to see if the requests actually make through your firewall to to server?
    No I haven't. I'm primarily a Windows person with only a little Linux and networking knowledge. How do I use tcpdump for this?

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    Quote Originally Posted by toricred View Post
    I've got a server setup on FC5 running the latest version as of 4/28/07. It sits behind a Netgear SPI firewall router (SPI is turned off) with split DNS configured. Everything works perfectly on the local LAN and e-mails are successfully sent and received from outside servers. The only problem is that when I try to access the web interface for checking mail outside my LAN, I get no response from the server. I have port forwarding turned on for ports 80, 443, and 25 (all TCP and UDP). I seem to be able to telnet to port 80 on the server, but I can't get the web page to come up. Any suggestions?
    PM me the external IP address if you want me to take a look. What it may be is that you cannot access the external IP via an internal machine. This is a fairly common limitation of most NAT setups.

    Try asking a buddy to test it out from an external network. He might see the webpage.

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    Quote Originally Posted by jonnyRo View Post
    PM me the external IP address if you want me to take a look. What it may be is that you cannot access the external IP via an internal machine. This is a fairly common limitation of most NAT setups.

    Try asking a buddy to test it out from an external network. He might see the webpage.
    I'll PM you in just a minute, but I think you are understanding the problem backwards. I can access it internally, it is externally I can't access it.

    PM sent (2 actually).
    Last edited by toricred; 05-01-2007 at 07:32 PM. Reason: More information

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    Quote Originally Posted by toricred View Post
    I'll PM you in just a minute, but I think you are understanding the problem backwards. I can access it internally, it is externally I can't access it.

    PM sent (2 actually).
    I don't know what I did (maybe changing to a static IP address), but all is working now.

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