The Galaxy Main server at http://usegalaxy.org has some delays right now.
Problems may manifest as slow server response time (impacting several functions, including download), extended job wait times (these will eventually run), and job failures.
If a job fails - try to rerun.
Another update will be posted, when corrected, to this thread - please follow it for status: https://biostar.usegalaxy.org/p/22075/
Thanks, Jen, Galaxy team