Hello, all. I've setup a squid instance on site so that I can cache .deb files and speed up on updating our systems (we run a mostly-debian shop). I've configured Squid according to the instructions found here: http://itkia.com/using-squid-to-cache-apt-updates-for-debian-and-ubuntu/ and configured apt on all our Debian systems to use squid as an HTTP proxy. Whenever I run "apt-get update", I get the followings errors: W: GPG error: http://ftp.debian.org squeeze-updates Release: The following signatures were invalid: BADSIG AED4B06F473041FA Debian Archive Automatic Signing Key (6.0/squeeze) <ftpmaster@xxxxxxxxxx> W: GPG error: http://security.debian.org squeeze/updates Release: The following signatures were invalid: BADSIG AED4B06F473041FA Debian Archive Automatic Signing Key (6.0/squeeze) <ftpmaster@xxxxxxxxxx> W: GPG error: http://backports.debian.org squeeze-backports Release: The following signatures were invalid: BADSIG AED4B06F473041FA Debian Archive Automatic Signing Key (6.0/squeeze) <ftpmaster@xxxxxxxxxx> These errors disappear when I remove /etc/apt/apt.conf.d/proxy and force apt to work around the proxy. Can anybody tell me what's wrong with the configuration at the website above ? Emmanuel