Failed to fetch...

Cron-apt email gives me the following message and tells me that some packages could not be fetched:

CRON-APT RUN [/etc/cron-apt/config]: Sun Jun 12 20:04:06 CEST 2016
CRON-APT SLEEP: 3232, Sun Jun 12 20:57:58 CEST 2016
CRON-APT ACTION: 0-update
CRON-APT LINE: /usr/bin/apt-get -o Acquire::http::Dl-Limit=25 update -o quiet=2
W: Failed to fetch http://packages.openmediavault…s/stoneburner/Release.gpg Could not connect to packages.openmediavault.org:80 (178.254.11.33). - connect (110: Connection timed out) [IP: 54.192.46.174 80]

E: Some index files failed to download. They have been ignored, or old ones used instead.

Thanks, I think it was only related to my internet connection. Clicking the check button in general works.