Hi Roel,

I switched a test box to use your sources.list extract and added
locale nl_NL.UTF-8 and made it the default.  "apt-get update" works
for me (see below).

I suggest you try using tshark or wireshark to see exactly what is
happening when you get the 501 errors.

Also, FWIW, you can probably see English text in a Dutch system
by prefixing a locale overide, e.g. "LC_ALL=C apt-get update".

--Mike


Geraakt http://ppa.quickbuild.pearsoncomputing.net wheezy/main Sources
Ophalen:29 http://ftp.us.debian.org testing/main Translation-en/DiffIndex 
[7876 B]
Geraakt http://ppa.quickbuild.pearsoncomputing.net wheezy/main i386 Packages
Ophalen:30 http://ftp.us.debian.org testing/non-free Translation-en/DiffIndex 
[7819 B]
Geraakt http://ppa.quickbuild.pearsoncomputing.net wheezy/main Sources
Geraakt http://ppa.quickbuild.pearsoncomputing.net wheezy/main i386 Packages
Genegeerd http://ppa.quickbuild.pearsoncomputing.net wheezy/main 
Translation-nl_NL
Genegeerd http://ppa.quickbuild.pearsoncomputing.net wheezy/main 
Translation-nl
Genegeerd http://ppa.quickbuild.pearsoncomputing.net wheezy/main 
Translation-en
Genegeerd http://ppa.quickbuild.pearsoncomputing.net wheezy/main 
Translation-nl_NL
Genegeerd http://ppa.quickbuild.pearsoncomputing.net wheezy/main 
Translation-nl
Genegeerd http://ppa.quickbuild.pearsoncomputing.net wheezy/main 
Translation-en
440 kB opgehaald in 14s (31,0 kB/s)
Pakketlijsten worden ingelezen... Klaar