The netgroup search does not continue to search in NIS if the entry is not found in LDAP
If the netgroups lookup order in the nsswitch settings is LDAP followed by NIS, a netgroup search does not continue to search in NIS if the netgroup entry is not found in LDAP. In this case, if the share is exported using netgroups, the NFS mount on the NFS client fails.
(3559219)
Workaround:
Change the netgroups lookup order so that NIS is before LDAP:
Network> nsswitch conf netgroups nis ldap