Bug#526595: bug 519774: dns resolution error with libc6
Version: 2.9-4 2.9-8 2.9-9
I too have been bitten by this bug. Essentially, name resolution quits working with many apps. What is especially bad about this bug is that it also effects aptitude! As you can imagine, this can lead to a really bad catch22 situation. Especially for users less proficient with Debian and/or Linux.
Version 2.9-7 is the only version without this bug. Versions 2.9-4, 2.9-8, and 2.9-9 all have this name resolution bug. Hope this information can be of some help in trying to track down the bug