Long live https://blogs.oracle.com.
It appears that blogs.sun.com URLs no longer work. They are now blogs.oracle.com.
An Oracle employee is working his way through the relatively small number on ServerFault; however, SO has 800+ links and there may be others throughout the network.
I've randomly checked a sample of the links and simply changing sun to oracle fixes them.
The problem ones are like this http://blogs.sun.com/chengfang/entry/why_am_i_using_netbeans which should now be http://blogs.oracle.com/chengfang/entry/why_am_i_using_netbeans
Can someone with suitable powers fix the links network wide?