NFS Troubleshooting - Mounting issue

Am i missing something. Please help to know why i’m getting permission issue?

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Can you share your /etc/exports file contents ?

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Hello, @amuthan1983
Have you ran the command exportfs -r?

Yes i have ran exportfs -r , also checked with exportfs -v and it shows desired results.

Finally working by open the share to all servers instead of 3 specific servers alone.

/app *(rw,sync,fsid=0,no_root_squash,crossmnt,no_subtree_check,no_acl)