Methods and apparatus to ensure the security of server partitioning. The method is performed on a multi-socket platform including first and second sockets interconnected by a socket-to-socket interconnect, the multi-socket platform being capable of being configured in a first partition mode with a single partition using both the first and second sockets and a second partition mode under which the first and second sockets are partitioned as respective first and second partitions. Following the platform being operated in the single partition mode, the first socket is rebooted to be operated as local socket in a separate partition under the second partition mode and under which communication over the socket-to-socket interconnect is disabled without using any communication between the first and second sockets. Softstrap and hardware strap partition mode configuration schemes are provided to implement the method on various multi-socket platform architectures.