SMB Protocol Negotiation Failed
Normally SMB takes care of choosing the appropriate protocol for each connection. However, if the offered protocols are out of client’s default range, it will return an error message like this:
Protocol negotiation failed: NT_STATUS_IO_TIMEOUT
Edit the connection protocol range in the client configuration file.
client min protocol and
client max protocol settings to
# /etc/samba/smb.conf [global] client min protocol = CORE client max protocol = SMB3