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In his session at NGINX Conf 2018, ErnestoChaves, a Senior Network Engineer at AppNexus, describes how and why the company replaced all of the F5Networks BIG‑IP hardware load balancers in its global data centers with NGINXPlus. He details the motivations, pitfalls, and successes of the transition from proof of concept through to implementation. In this blog we highlight some key takeaways. You can watch the complete video here: Solutions that were the best choice at the time don’t always stay that way. Six years after their initial deployment at AppNexus in2009, F5BIG‑IP load balancers were struggling to keep up with increasing traffic. They also suffered from hardware failures, random rebooting, and memory leaks, among other issues.