Can't push to project after downtime, worked fine before

I opened a new project a few hours ago, and pushed some code to launchpad without problems. I then did a few things while launchpad was down for maintenance, and now I can't push anymore. The error message is basically an authentication error:

Permission denied (publickey).
bzr: ERROR: Connection closed: please check connectivity and permissions (and try -Dhpss if further diagnosis is required)

Is this something that is expected after maintenance (I'm new here, I haven't seen one before), or could this be a sign that something went wrong? I haven't changed anything on my end, so this should work with no problems.