mac - Why can't I mount shares by SMB since High Sierra

Since I updated to High Sierra (directly to 10.13.1) I can't connect my iMacs and MacBook any more by AFP protocol, so I tried SMB.

open 'smb://user:password@S/Share' :: works, but shows Finder on the screen.

Another problem is that I can't choose the mount point's name. I work from JAVA applications and thus should work from the command line:

mkdir /Users/user/Volumes/Share/

/sbin/mount -t smbfs //user:password@S/F /Users/user/Volumes/Share/

But this gives:

mount_smbfs: server rejected the connection: Authentication error

What did I do wrong or forgot about? Thanks in advance. ;JOOP!