> On 21 Jul 2020, at 11:06, Eda Oktay <eda.oktay at metu.edu.tr> wrote: > > Dear Lawrence, > > I am using MPICC but not Mac, Fedora 25. If it will still work, I will try that. > > Thanks! It might be the case. When you observe the error, does "nslookup localhost" take a long time? Lawrence