Can't connect to CIFS fs

[slavonnet]

if i try //192.168.169.205/linuxbackup:
vdsm.storage.mount.MountError: Command ['/usr/bin/mount', '-t', 'cifs', '-o', 'user=xxxx,domain=dev.xxx.group,password=XXXX', '/192.168.169.205/linuxbackup', '/rhev/data-center/mnt/_192.168.169.205_linuxbackup'] failed with rc=1 out=b'' err=b'mount.cifs: bad UNC (/192.168.169.205/linuxbackup)\n'

if i try \\192.168.169.205\linuxbackup:
FileNotFoundError: [Errno 2] Mount of `\\192.168.169.205\linuxbackup` at `/rhev/data-center/mnt/\\192.168.169.205\linuxbackup` does not exist