When you install Yosemite Backup solution on a server having multiple network cards, the agents will not work and the server will not be visible by the master server. This is because Yosemite binds itself to a network card. Now, to fix this, simply edit the ytconfig.ini in the Yosemite folder and add the following line under the configuration tab and set it to your the IP address of the network card:

bindTo=10.1.1.1