Repo connection issue during letsencrypt setup

Configuration
1

I’m trying to setup letsencrypt ssl and keep getting stopped at

Could not connect to mirror.umd.edu:80 (129.2.73.2), connection timed out

Is there some way I can tell it to use a different mirror?

2

Figured it out by changing the following in sources.list

#deb http://mirrordirector.raspbian.org/raspbian/ jessie main contrib non-free rpi
deb http://mirror.os6.org/raspbian/raspbian/ jessie main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://archive.raspbian.org/raspbian/ jessie main contrib non-free rpi