Samba windows 10 share: mount error(112): Host is down

edit

Smbclient works fine:

[root@sgwkskev01 kev]# smbclient //192.168.1.19/s -mSMB3 -UKevin
Enter Kevin's password: 
Domain=[SGSVR01] OS=[] Server=[]
smb: \>

But could not mount:

[root@sgwkskev01 kev]# mount -t cifs -o username=Kevin,password=******** //sgsvr01/s /mnt/a
mount error(112): Host is down
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
[root@sgwkskev01 kev]#