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Thread: ;; connection timed out; no servers could be reached

  1. #1
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    Question ;; connection timed out; no servers could be reached

    hello everyone,
    I am searching for the answer of this error, but couldnt able to find the solution. I am using RHEL 5 and I could ping the other servers but couldnt use nslookup and dig those servers. The server sits on internal network behind firewall in DMZ.

    /etc/resolv.conf file:
    search mydomain.com
    nameserver public_dns1_ipaddress
    nameserver public_dns2_ipaddress

    /etc/hosts file:
    127.0.0.1 myhostname.mydomain.com localhost.localdomain localhost myhostname
    xx.xx.xx.xx myhostname.mydomain.com myhostname
    xx.xx.xx.xx mailserver.mydomain.com mailserver

    I could ping all the servers declared in /etc/hosts file (with ip-address, hostname and FQDN). But when I try to use nslookup or dig or host commands, I am getting the error ";; connection timed out; no servers could be reached" (even for my own server). I know there is some kind of error in configuration for DNS resolution, but I could able to find it. Please help me as this server is a high priority issues for me.

    Thanks.

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    Your server are reside in internal network and you are using public DNS.

    Is there any DNS server for internal network?
    put local DNS entry in /etc/resolv.conf file.

    Regards,

  3. #3
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    Yeah. These people are using public IP address for the internal network also. Thats a change we have to implement in future.
    Anyhow, the issue is being resolved as the firewall is blocking DNS port (53). Its working fine after opening port 53.

    Thanks for the reply though

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