Resolving UnknownHostException right after installing Jenkins

I've just installed Jenkins on my CentOS 6.4 using the very instructions provided on Jenkins website:
Installing Jenkins on RedHat distributions

After the installation, even though Jenkins was up, I was getting the following exception on logs:

WARNING: Could not intialize the host network interface on nullbecause of an error: centos64: centos64: Name or service not known
java.net.UnknownHostException: centos64: centos64: Name or service not known
    at java.net.InetAddress.getLocalHost(InetAddress.java:1473)
    at javax.jmdns.impl.HostInfo.newHostInfo(HostInfo.java:75)
    at javax.jmdns.impl.JmDNSImpl.<init>(JmDNSImpl.java:407)
    at javax.jmdns.JmDNS.create(JmDNS.java:60)
    at hudson.DNSMultiCast$1.call(DNSMultiCast.java:32)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.net.UnknownHostException: centos64: Name or service not known
    at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
    at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
    at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293)
    at java.net.InetAddress.getLocalHost(InetAddress.java:1469)
    ... 8 more

Now I don't have the slightest clue about why was jenkins trying to resolve to a server called centos64, but adding that entry to my /etc/hosts file resolved the problem:

127.0.0.1   localhost centos64

It guess it must have used some default configuration and got that network hostname that didn't exist.