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Hi, I am with the IDAES team. We were testing a software package for the IDAES framework that depends on calling NEOS solvers. The issue is that when there are SOS2 constraints in the Pyomo model, neos-cplex will return an error, and nothing will be processed. The reason may be that Pyomo writes an AMPL file to NEOS. And AMPL does not support SOS2, which is indeed supported by CPLEX. Changing the SOS2 to other formulations may have an impact on model tractability. So hopefully, this could be resolved in the future.