The appln which is tried to connect yahoo and google throws UnknownHostException

Tested OS : windows
Tested Build : PIT 6U1 B1

Steps to reproduce :
1. Install PIT 6u1 b1
2. In the Java control panel, enable java console
3. Launch the following appln : http://web-east.east/www/tests/1.7.0/6475003/test.jnlp
It will spawn two threads to connect to two internet sites (google and yahoo).
After accepting the security dialog, the UnknownHostException is displayed in the java console

java.net.UnknownHostException: www.yahoo.com
        at java.net.InetAddress.getAllByName0(Unknown Source)
        at java.net.InetAddress.getAllByName0(Unknown Source)
.
.
.
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
        at test.run(test.java:26)
        at java.lang.Thread.run(Unknown Source)
network: Connecting http://www.yahoo.com/index.html with cookie "B=ahhruld2nf8n3&b=3&s=5i;
.
.
URL: http://www.yahoo.com/index.html responseCode: 200