Whenever I tried to login to salesforce https://www.salesforce.com/services/Soap/xxxxx, I got this exception.

Are there any who have the same problem andhave solved it?

Thanks,

AxisFault faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
 faultSubcode:
 faultString: java.net.UnknownHostException: www.salesforce.com
 faultActor:
 faultNode:
 faultDetail:
        {http://xml.apache.org/axis/}stackTrace:java.net.UnknownHostException: www.salesforce.com
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:519)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:549)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.<init>(SSLSocketImpl.java:351)
        at com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:69)
        at org.apache.axis.components.net.JSSESocketFactory.create(JSSESocketFactory.java:92)
        at org.apache.axis.transport.http.HTTPSender.getSocket(HTTPSender.java:191)
        at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:404)
        at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138)
        at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
        at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
        at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
        {http://xml.apache.org/axis/}hostname:kenfig
        ... more

java.net.UnknownHostException: www.salesforce.com
        at org.apache.axis.AxisFault.makeFault(AxisFault.java:101)
        at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:154)
        at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
        at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
        at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
        at org.apache.axis.client.AxisClient.invoke(AxisClient.java:165)
        at org.apache.axis.client.Call.invokeEngine(Call.java:2784)
        at org.apache.axis.client.Call.invoke(Call.java:2767)
        at org.apache.axis.client.Call.invoke(Call.java:2443)
        at org.apache.axis.client.Call.invoke(Call.java:2366)
        at org.apache.axis.client.Call.invoke(Call.java:1812)
        ... more

Caused by: java.net.UnknownHostException: www.salesforce.com
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:519)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:549)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.<init>(SSLSocketImpl.java:351)
        at com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:69)
        at org.apache.axis.components.net.JSSESocketFactory.create(JSSESocketFactory.java:92)
        at org.apache.axis.transport.http.HTTPSender.getSocket(HTTPSender.java:191)
        at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:404)
        at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138)
        ... 108 more