root@higginsp6:~# apt-get update
...

W: GPG error: http://ftp.us.debian.org testing Release: The following signatures were invalid: BADSIG A70DAF536070D3A1 Debian root@higginsp6:~# netstat -npt
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 137.16.51.209:44957     212.211.132.32:80       TIME_WAIT   -               
tcp        0      0 137.16.51.209:46307     64.50.236.52:80         TIME_WAIT   -               
root@higginsp6:~# dig -x 212.211.132.32

32.132.211.212.in-addr.arpa. 76858 IN	PTR	villa.debian.org.

root@higginsp6:~# dig -x 64.50.236.52

52.236.50.64.in-addr.arpa. 43200 IN	PTR	ftp-chi.osuosl.org.

#################################################################
## Retry:

W: GPG error: http://ftp.us.debian.org testing Release: The following signatures were invalid: BADSIG A70DAF536070D3A1 Debian root@higginsp6:~# netstat -npt
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 137.16.51.209:55344     212.211.132.250:80      TIME_WAIT   -               
tcp        0      0 137.16.51.209:44802     64.50.238.52:80         TIME_WAIT   -               
root@higginsp6:~# dig -x 64.50.238.52

52.238.50.64.in-addr.arpa. 43200 IN	PTR	ftp-atl.osuosl.org.

root@higginsp6:~# dig -x 212.211.132.250

250.132.211.212.in-addr.arpa. 86400 IN	PTR	lobos.debian.org.


#################################################################
## Retry:
W: GPG error: http://ftp.us.debian.org testing Release: The following signatures were invalid: BADSIG A70DAF536070D3A1 Debian root@higginsp6:~# netstat -npt
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 137.16.51.209:55940     128.30.2.36:80          TIME_WAIT   -               
tcp        0      0 137.16.51.209:43538     212.211.132.250:80      TIME_WAIT   -               
root@higginsp6:~# dig -x 128.30.2.36

36.2.30.128.in-addr.arpa. 1800	IN	PTR	rocky-mountain.csail.mit.edu.