sudo mount //ip/share /media/share -o username=user,password=password,workgroup=workgroup

mount error(5): Input/output error
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

sudo mount -t cifs //ip/share /media/share --verbose -o user=user,domain=workgroup,pass=password

mount.cifs kernel mount options:
ip=xxx.xxx.xxx.xxx,unc=\xxx.xxx.xxx.xxxshare,user=user,,domain=workgroup,pass=********
mount error(5): Input/output error
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)