Debian 6.0.5 not on mirrors?

["Bruce A. Johnson" <spamtrap1@topcog.com>]

I've tried two different Debian 6.0.5 network installation CDs today using
three different mirror sites, and I don't get past the apt installation. 
When I look at pseudo-tty 4, the log says that the "mirror does not support
the specified release".  The lines immediately above this failure show that
this command was executed:

wget -q http://cdn.debian.net/debian/dists/squeeze/Release -O - | grep -E
'^(Suite|Codename):'

If I run this command from another workstation in the same network, I get
this output for the command:

Suite: stable
Codename: squeeze

The machine doing the installation seems to have network connectivity, or
I would have expected complaints when it was trying to get the time from
the network, plus it was a working system under Debian 5 before I started
this morning.  Does anyone have any suggestions?

Thanks!
-- 
Bruce A. Johnson
Herndon, Virginia