I'm finding that during the past week, I've encountered a number of occasions where restarting wowza on an Ec2 devpay instance results in a license check failure:
"The Wowza Media Systems Software licensing system has determined that your license key is not valid. Please validate that your are using the correct license key. If this problem persists, please visit http://www.wowza.com/subscriptionsupport.php for up to date information."
Restarting the wowza service again clears things up, but it leaves me wondering if there's an issue with the licensing server(s).
For my own instances this isn't a big deal, but for my client's instances, it could prove problematic, as they won't know to dig into the logs to see why Wowza didn't fire up after a restart.
If it helps, I'm using ami-465edb2f