During the Satellite installation:

Enable UNIX support on the Satellite by checking the "Enable Solaris Support" box during the installation process, as pictured:

After the Satellite has been installed:

Enable UNIX support by configuring the Satellite after it has been installed. To do so, select Satellite Tools in the top menubar, then select Satellite Configuration in the left navigation bar. In the screen that follows, check the Enable Solaris Support box, as pictured:

Click the Update Configuration button to confirm the change.

Finally, you must create a base channel to which your client systems may subscribe. This is because RHN does not provide UNIX content; as a result, you cannot use satellite-sync to create the channel.

To create a Solaris channel, login to the web interface of the Satellite as either an Satellite Administrator or a certificate authority. Navigate to the Channel tab, followed by the Manage Software Channels from the left navigation bar. Click the create new channel link in the upper right of the resulting screen. Provide a name and label for your new channel, and select either Sparc Solaris or i386 Solaris as the architecture, depending on the architecture of your client.