The problem seems more general than I first thought. [b]No java package (including e.g. Netbeans) can access to the Internet[/b] I can't make a PostgresQL db connection from Netbeans or Netbeans can't show the pages from Internet that it display when opened.
There are no connection problems other than this. I checked config files under /etc/java/ /etc/.java/ /etc/java-6-sun/ and /etc/java-6-openjdk/ but found nothing relevant. These files are not modified after installation.
The same problem arised in my laptop (running Debian Squeeze) too.
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