Hello,

I'm using ubuntu server 16.04. Installed owncloud on it. (running apache2, php, mariadb ofc)
I've an NAS Windows Server (172.16.6.5). Using it for owncloud file storage. So I've edited /etc/fstab like;


//172.16.6.5/cloud$ /media/owncloud cifs credentials=/cred/credentials,sec=ntlm,gid=www-data,file_mode=0770,dir_mode=0770 0 0

Ubuntu's ip address is 172.16.6.11.
This is working good with no problems.

But now I want to create mysql & other backup files on NAS too. So I created another windows user and network share on NAS for backup operations. Then I edited /etc/fstab again. Added the line below;
//172.16.6.5/WebCloud$ /media/backup cifs credentials=/cred/credentials2,sec=ntlm,gid=root,file_mode=0770,dir_mode=0770 0 0

(Why I use another user and network path? I have another ubuntu servers to backup and I will use backup user for other servers too)

When I reboot ubuntu it mounts windows share on /media/backup. I can write, read on that. No problems yet. But after 3-4 hours or maybe 1-2 hours when I use "sudo ls /media/backup" reply is "ls: cannot access 'backup': Host is down"

While /media/owncloud is up for months wihtout any problems why new cifs mount is disconnecting? What's the problem with that?

I've searched on web find some solutions. but does not fit for my issue. both same servers, both same network, both same mount options. But one is working other is not

I'd run into CIFS mount timeouts on a RHEL server.

Ultimately the resolution was to modify the Windows server that was doing the share to disable the Windows server Idle Connection Timer. The suggestion was that could be done by issuing "net config server /autodisconnect:-1" on the Windows server. Also I saw mention of disabling "Stealth Mode" which is described in a MS link:
https://msdn.microsoft.com/en-us/library/ff720058.aspx

Since our MS Admins here did the actual modification(s) on the Windows servers that resolved our RHEL mount timeouts I can't say for sure if they did the above but assume they did as I'd provided them that information.

Set one system that doesn't hibernate to master browser??

Isn't there some other way to set windows to browse and offer netbios or lmhosts???

For now I use a temporary solution.
I set a Cron job. "*/5 * * * * touch /media/backup/keepalive.txt"

MensaWater, I'll disable cron job and check your solution. edit: "didin't work "

jefro, it has a netbiosname but I used Ip instead. none of systems hibernate.