Nautilus can see network shares, but not join

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Samba is for serving files, not connecting to shares. You can mount them as root, see "man mount.cifs". You can also mount smb urls in Nautilus undef "other connections" For the smb uri schemes, see https://www.iana.org/assignments/uri-.... I'd imagine there must be some security on your NAS dev so you probably need to supply that as that link specifies. Note that you NAS dev is probably running some version of samba too and if you made changes to it in the past, like in the hosts allow global key, that could be affecting you too.