Hello,  Thank you for your question! Can you let me know which version of OneFS that you are running? From what I have been able to find, this can be a side effect of NFS moving into the user space beginning with 7.2, also called uNFS.  The API daemon on the cluster, isi_papi_d, reads information from gconfig files, and returns this "unresolved" for all hosts in client lists. This is working as designed at the moment. While inconvenient, the bug is cosmetic in nature and your clients would still be able to connect to the export.  Please let me know if you have any additional questions or concerns!
I've created an NFS share, with clients foo.example.com and bar.example.com.  From the CLI, nslookup is able to resolve both name, however the same names are listed as unresolved clients.  For the time being, I've also added the IP addresses of the clients.  Can someone explain what's going on?
What are "Unresolved Clients" on the NFS Exports page?