5.2.1 SMB connexion broken to Mac 10.12.4

Hi, tonight launching the automatically installed 5.2.1 update on my ATV4, I could not watch a movie. I then found out that my shared volumes were not indexed, deleted the shares and started anew. No way: in SMB I have an endless connexion message on black screen, in NFS, I get an immediate connexion, see the volumes but Infuse reports a generic connexion error when trying to access them.
I can connect fine from other machines wth the same account and credentials.