Commit 51d5220f6c19c4e7d5c35a07b62219472b2a7870 changed the RedeployPublisher such that the global Maven settings are no longer checked as fallback, if no per user configuration is found. The Build Slave is running as a service and thus as no user. Hence, the RedeployPublisher requires the configuration to be in C:\.m2\. As a result I have to copy the settings.xml to this location, and maintain both identical files in order to have it available for the service as well as when I log in to the machine manually.
Build Master on Ubuntu, Build Slave on Windows XP as a service