Firewall, Port settings

Posted on 2008-11-07
Last Modified: 2013-11-16

I have a problem in which I believe is a firewall, routing, port, issue. I want to be able to show proof to my network guy that that is the problem.

I have 2 servers... SERVER1 and SERVER2

From SERVER1, I'm able to log into....
but I cannot from SERVER2.

What tools can I use as a programmer to confirm and isolate the problem?
Question by:silentthread2k
    LVL 42

    Expert Comment

    1. Do a traceroute, in windows command is "tracert" to make sure that you're getting to the server
    2.  If you're getting to the server and but can't access take a look at firewall realtime logs and check what is being blocked. This will also tell you if it's denying access to the server to begin with.

    Hope this helps

    Author Comment

    Thanks, I tried tracert but both SERVER1 and SERVER2 give the following...
    Unable to resolve target system name
    LVL 2

    Accepted Solution

    With the tracert do a tracert to the IP address of each server.  You can't trace to a URL.

    Next from server1 to server2, open a command prompt and telnet to the ip address of server 2 on port 80.

    From command prompt

    telnet ipaddress 80

    If you get a connection refused verify your web server is running by connecting locally.

    LVL 42

    Expert Comment

    do a tracert

    since it uses icmp protcol you can't do it using https in front of it.

    Or you can do it by IP Address.

    The ip address is


    see what you get from both servers
    LVL 12

    Expert Comment

    If the error you're getting is "Unable to resolve target system name", you've got a DNS issue to deal with. Can SERVER2 resolve other addresses? It may very well be that the connectivity is there.

    Author Comment

    The telnet did the trick. I was able to telnet from my PC to SERVER1, but not to SERVER2, I got a connection failer.

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