Bamboo 2.2.3 Upgrade Guide
Upgrading from Bamboo 2.2.2 to 2.2.3
settings.xml file that is shipped with Bamboo no longer contains references to the Atlassian internal maven proxies. If you were relying on these proxies (for your EBS volumes), you can either edit the file to reference your own maven proxies or rely on the default ones.
Please also follow the Bamboo upgrade guide.
Upgrading from Bamboo 2.1.x or earlier
In addition to the above, please read the Bamboo 2.2 Upgrade Guide and the Upgrade Guide for every version you are skipping during the upgrade.