[dundee] BT 4 apt-get problem

[Jacek Sapieja]

hello

I am getting this error while trying to do    apt-get update.
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Err http://archive.offensive-security.com pwnsauce Release.gpg
Could not resolve 'archive.offensive-security.com'
Reading package lists... Done
W: Failed to fetch http://archive.offensive-security.com/dists/pwnsauce/Release.gpg  Could not resolve 'archive.offensive-security.com'

W: Some index files failed to download, they have been ignored, or old ones used instead.
W: You may want to run apt-get update to correct these problems
 
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This is Backtrack 4 . I am not behind any proxy 

Any hints  ?

 Jacek