Today I logged in to my blog and accidentally clicked the “Update” button, it did it’s jazz and I just left the page.
I was then prompted by this error:
Briefly unavailable for scheduled maintenance. Check back in a minute
After waiting 5 minutes and realising that it wasn’t going back up I remote FTP’d to the folder and found a .maintenance file.
The best way to fix wordpress after this error is to just delete the file: .maintenance
After that, visit your blog again – It’ll tell you that you’re required to update your WordPress Database, click “Do it now!” and off you go – back online and ready to roll!