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unable to resolve the DNS name

I have installed hadoop-hbase cluster (CDH3 distribution).
I am getting following error while trying to connect HBase table using Java

11/08/01 20:44:57 ERROR hbase.HServerAddress: Could not resolve the DNS name
of dpev266:60000
Exception in thread "main" java.lang.IllegalArgumentException: Could not
resolve the DNS name of dpev266:60000
    at org.apache.hadoop.hbase.HServerAddress.<init>(HServerAddress.java:66)
    at org.apache.hadoop.hbase.client.HBaseAdmin.<init>(HBaseAdmin.java:89)
    at com.ibm.ssi.dao.TestDao.<init>(TestDao.java:27)
    at com.ibm.ssi.dao.TestDao.main(TestDao.java:38)

"host dpev266" is working and giving me IP address of the host.
reverse look-up is also working.