Error Validating Storage Provider: mount failure, server: 1.1.1.1, export: /nfs1, nfs version: 3, returned state: 13

 NFS share mount on client failed:

Error Validating Storage Provider: mount failure, server: 1.1.1.1, export: /nfs1, nfs version: 3, returned state: 13

Solution:

On the NFS server:

vi /etc/exports nclude insecure option as 

/nfs1 *(rw,sync,insecure,no_subtree_check,no_root_squash)

then run: exportfs -a