Login timeout connectivity error

Unable to connect to Teradata Database.
Getting below error while pinging on Teradata Studio Express.
IPs ahve been added to hosts file also.
Request to provide resolution as soon as possible.
com.teradata.jdbc.jdbc_4.util.JDBCException: [Teradata JDBC Driver] [TeraJDBC 14.00.00.21] [Error 1277] [SQLState 08S01] Login timeout for Connection to 165.72.222.108 Mon Dec 02 12:58:49 IST 2013 socket orig=165.72.222.108 cid=5515e7 sess=0 java.net.SocketTimeoutException: connect timed out   at java.net.PlainSocketImpl.socketConnect(Native Method)   at java.net.PlainSocketImpl.doConnect(Unknown Source)   at java.net.PlainSocketImpl.connectToAddress(Unknown Source)   at java.net.PlainSocketImpl.connect(Unknown Source)   at java.net.SocksSocketImpl.connect(Unknown Source)   at java.net.Socket.connect(Unknown Source)   at com.teradata.jdbc.jdbc_4.io.TDNetworkIOIF$ConnectThread.run(TDNetworkIOIF.java:969) 
 at com.teradata.jdbc.jdbc_4.util.ErrorFactory.makeDriverJDBCException(ErrorFactory.java:93)
 at com.teradata.jdbc.jdbc_4.util.ErrorFactory.makeDriverJDBCException(ErrorFactory.java:68)
 at com.teradata.jdbc.jdbc_4.util.ErrorFactory.makeIoJDBCException(ErrorFactory.java:206)
 at com.teradata.jdbc.jdbc_4.util.ErrorAnalyzer.analyzeIoError(ErrorAnalyzer.java:61)
 at com.teradata.jdbc.jdbc_4.io.TDNetworkIOIF.createSocketConnection(TDNetworkIOIF.java:138)
 at com.teradata.jdbc.jdbc_4.io.TDNetworkIOIF.<init>(TDNetworkIOIF.java:117)
 at com.teradata.jdbc.jdbc_4.TDSession.getIO(TDSession.java:585)
 at com.teradata.jdbc.jdbc.GenericLogonController.run(GenericLogonController.java:95)
 at com.teradata.jdbc.jdbc_4.TDSession.<init>(TDSession.java:214)
 at com.teradata.jdbc.jdk6.JDK6_SQL_Connection.<init>(JDK6_SQL_Connection.java:34)
 at com.teradata.jdbc.jdk6.JDK6ConnectionFactory.constructConnection(JDK6ConnectionFactory.java:22)
 at com.teradata.jdbc.jdbc.ConnectionFactory.createConnection(ConnectionFactory.java:130)
 at com.teradata.jdbc.jdbc.ConnectionFactory.createConnection(ConnectionFactory.java:120)
 at com.teradata.jdbc.TeraDriver.doConnect(TeraDriver.java:232)
 at com.teradata.jdbc.TeraDriver.connect(TeraDriver.java:158)
 at com.teradata.datatools.dtp.connectivity.db.teradata.TeradataJDBCConnection.makeConnection(TeradataJDBCConnection.java:293)
 at com.teradata.datatools.dtp.connectivity.db.teradata.TeradataJDBCConnection.createConnection(TeradataJDBCConnection.java:121)
 at org.eclipse.datatools.connectivity.DriverConnectionBase.internalCreateConnection(DriverConnectionBase.java:105)
 at org.eclipse.datatools.connectivity.DriverConnectionBase.open(DriverConnectionBase.java:54)
 at org.eclipse.datatools.connectivity.drivers.jdbc.JDBCConnection.open(JDBCConnection.java:73)
 at com.teradata.datatools.dtp.connectivity.db.teradata.TeradataPingFactory.createConnection(TeradataPingFactory.java:36)
 at org.eclipse.datatools.connectivity.internal.ConnectionFactoryProvider.createConnection(ConnectionFactoryProvider.java:83)
 at org.eclipse.datatools.connectivity.internal.ConnectionProfile.createConnection(ConnectionProfile.java:359)
 at org.eclipse.datatools.connectivity.ui.PingJob.createTestConnection(PingJob.java:76)
 at org.eclipse.datatools.connectivity.ui.PingJob.run(PingJob.java:59)
 at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.net.SocketTimeoutException: connect timed out
 at java.net.PlainSocketImpl.socketConnect(Native Method)
 at java.net.PlainSocketImpl.doConnect(Unknown Source)
 at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
 at java.net.PlainSocketImpl.connect(Unknown Source)
 at java.net.SocksSocketImpl.connect(Unknown Source)
 at java.net.Socket.connect(Unknown Source)
 at com.teradata.jdbc.jdbc_4.io.TDNetworkIOIF$ConnectThread.run(TDNetworkIOIF.java:969)
 
Thanks.