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Reliable server pooling (rSerPool) is an architecture and a set of protocols allowing a service provider to run several servers that can reliably provide the same service. Should a particular server fail while providing its service, another server can efficiently replace it. This property is attractive not only for wired but also for wireless networks. However, the unique characteristics of mobile ad hoc networks (MANETs) bring serious reliability and security challenges to the application of rSerPool. In this paper, we perform a comprehensive investigation of the security of rSerPool in MANET against both server failures and, especially, Byzantine attacks. We formulate security requirements for rSerPool in MANET and design efficient, distributed, and survivable security solutions for both main phases of rSerPool: service discovery and service provision. Specifically, we secure the service discovery phase by using a secure multiple-dominating set creation protocol, and the service provision phase by using a novel type of threshold signature scheme. Both protocols address novel security goals and are of independent interest as they can find applications to other areas; most notably, the construction of a distributed and survivable public-key infrastructure in MANET.