Gateway servers are only required if deploying adapters for Windows-based APIs such as MS Active Directory / Exchange, Domino, Novell NDS, etc.
Gateways should be located as close as possible to resources managed through the gateway and should be architected in pairs to support availability.Application servers at remote sites should use whatever primary gateway is close to those resources managed through the gateway and failover to the secondary gateway at that same site. If all gateway-managed resources are located close to one site, or the sites are located close together,a pair of gateways may be removed. Gateways require minimal resources, so gateway services may run on an existing Windows-based server machine with appropriate clients installed.
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