Thursday, February 18, 2010

Unable to resolve target system name - a DNS problem

I was not able to ping to any machines from my Windows 2003 server. I did following steps to debug & resolve the issue, which was related to a DNS problem.

1) Ping some-server
    Unknown host vm-cervino 

    2) Ping localhost
      Reply from 127.0.0.1: bytes=32 time<10ms TTL=48 (This is working)

      3) tracert some-server
      Unable to resolve target system name p4server.na.rsa.net. (This gave me a clue that it may be a DNS problem)
        4) ping 192.777.77.77 (IP address of some-server)                                                                         
        Reply from 192.777.77.77: bytes=32 time=4ms TTL=64 (This confirmed, it is a DNS issue.)
          5) I had another Linux machine, where DNS is working fine. I took the working DNS server IP address In Linux machine, DNS configuration is mentioned in /etc/resolv.conf file
            6) I configured my Windows Server to working DNS server IP address On Windows server, DNS configuration is mentioned in Start -> Control Panel -> Network Connections -> Local Area Connection -> Properties -> Internet Protocol (TCP/IP) -> Properties -> General tab -> Use the following DNS server addresses -> Preferred DNS server.

              After changing Preferred DNS server entry, I was able to connect to machines normally using Domain name.

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