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Re: [Samba] NT_STATUS_NETWORK_SESSION_EXPIRED Domain member




I’m not sure if it will help you but we’re seeing something similar that I call the “10 hours problem” here. On any Samba - after 4.7.6 (we’re currently trying out 4.9.4 but still no go) - at 10 hours after it (smbd & winbindd) was restarted it new connections often (but not 100% all the time, but we think it is related to the number of connections, or active connections, or how many are encrypted or something, since we’re not seeing it on the test servers with zero or just one or two connections).

We are running a monitoring system that tries to connect to the Samba server 24h/day every minute and we graph the response times. For 4.7.6 and earlier we see a short period (0-30seconds) where connections are denied, but any later version we see at least multi-minute login denials.

So I wrote a monitoring script that we run regularly (and every 2 minute around the time when we most often see this happeningen) and if it detects three failed connects (timeout of 20s and then sleep 5s before testing again) then it simply kills all winbindd daemons and restart them - and then things start to work again.

Please find our watchdog script included (as an unencoded file just for some historical fun, use “uudecode” to decode :). We currently run it from cron like this since we always restart both smbd & winbindd at 07:00 every day, we normally see these problems at 17:00 and 03:00...

> 1,5,10 * * * * /liu/sbin/samba-watchdog -v

You want to create a /liu/etc/samba-watchdog.ini file containing lines sort of like:

> username = testuser
> password = somesecretpasswod
> domain = YOURADDOMAIN

It by default will try to connect using NTLM authentication (but could be modified to also try Kerberos) and then connect to a share on //localhost/testuser (the username) using smbclient.

It will send emails to root on the local machine (via cron) that will look something like this:

> /liu/sbin/samba-watchdog: Notice: SMB connection to //hostname/testuser timed out
> Sun Dec 23 17:01:00 CET 2018
> /liu/sbin/samba-watchdog: Notice: SMB connection to //hostname/testuser timed out
> Sun Dec 23 17:01:20 CET 2018
> /liu/sbin/samba-watchdog: Notice: SMB connection to //hostname/testuser timed out
> Sun Dec 23 17:01:40 CET 2018
> /liu/sbin/samba-watchdog: Notice: Terminating winbindd processes: 71208 71202 71196 71193 71190 71189 
> /liu/sbin/samba-watchdog: Notice: Forcibly (SIGKILL) terminating remaining winbindd processes: 71196
> /liu/sbin/samba-watchdog: Notice: Starting winbindd daemons

(Originally we restarted after the first attempt failed but we wanted to really make sure things we “down” (in case of something temporarily happening) before killing winbindd and restarting those).

- Peter

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end


> On 23 Dec 2018, at 06:25, Chris via samba <samba@xxxxxxxxxxxxxxx> wrote:
> 
> On Mon, 17 Dec 2018 01:19:54 +0100
> Chris via samba wrote:
> 
>> If you're connecting from a Windows 10 client and do not add
>> 
>>   dedicated keytab file = /etc/krb5.keytab
>>   kerberos method = secrets and keytab
>>   winbind refresh tickets = Yes
>> 
>> to smb.conf, the SMB3_11 connection is closed, as soon as the service
>> ticket expires.
> 
> They're also closed with those lines.
> 
> Louis' stable stretch 4.8 package isn't affected.
> 
> I'll use NTLM now. It's still supported by Win10.
> 
> Keep it simple stupid.
> 
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