[Samba] smb connection closed

[Sascha Wiechmann]

Hi everybody,

May someone help me out on a short question, please? We own an ERP based 
on MSAccess, backend is on a samba share, openSuSe 42.3. The ERP is very 
sensitive on disconnection from those - also if it is just a reload of 
config.
We did not changed anything within the last week, but on thusday/friday 
my collegues started to comlain about "database or network error" 
message of our ERP. I started to check network etc and increased 
loglevel on samba-machine.
But, as really nothing changed in the whole month from my site, I did 
not think about a samba problem.

Today I checked the logs from one machine disconnecting quite often. My 
Question is : Do I understand well when I read the machine is closing 
the connection from client side?
As you can see, it tries to get oplock (am I right?) and then starts to 
close all files and ends connection.

............................

[2018/10/23 09:27:35.529661,  3] 
../source3/smbd/smb2_read.c:413(smb2_read_complete)
   smbd_smb2_read: fnum 591422384, file Navidata/Common/Cash.mdb, 
length=16384 offset=85655552 read=16384
[2018/10/23 09:27:35.531806,  3] ../source3/lib/util.c:1183(fcntl_getlock)
   fcntl_getlock: fd 45 is returned info 2 pid 0
[2018/10/23 09:27:35.531860,  3] 
../source3/smbd/smb2_read.c:413(smb2_read_complete)
   smbd_smb2_read: fnum 591422384, file Navidata/Common/Cash.mdb, 
length=16384 offset=85671936 read=16384
[2018/10/23 09:27:35.533803,  3] ../source3/lib/util.c:1183(fcntl_getlock)
   fcntl_getlock: fd 45 is returned info 2 pid 0

................
   samba1user closed file Navidata/Exchange/CustC/FUGermany.ldb 
(numopen=32) NT_STATUS_OK
[2018/10/23 09:28:46.678381,  2] 
../source3/smbd/close.c:788(close_normal_file)
   samba1user closed file Navidata/Common/AllCustomers.ldb (numopen=31) 
NT_STATUS_OK
[2018/10/23 09:28:46.678534,  2] 
../source3/smbd/close.c:788(close_normal_file)
   samba1user closed file Navidata/Common/Workbench.ldb (numopen=30) 
NT_STATUS_OK
[2018/10/23 09:28:46.678696,  2] 
../source3/smbd/close.c:788(close_normal_file)
   samba1user closed file Navidata/Retoure.ldb (numopen=29) NT_STATUS_OK
[2018/10/23 09:28:46.679274,  2] 
../source3/smbd/close.c:788(close_normal_file)

......

[2018/10/23 09:28:46.685862,  2] ../source3/smbd/service.c:1098(close_cnum)
   escjwaw7p100 (ipv4:192.168.0.100:50105) closed connection to service 
navidataesc
[2018/10/23 09:28:46.687056,  3] 
../source3/smbd/server_exit.c:242(exit_server_common)
   Server exit (NT_STATUS_CONNECTION_RESET)
  .................

And is there a hint for the NT_STATUS_OBJECT_NAME_NOT_FOUND error? I 
googled a lot but did not find anything helpful - hoped I will find a 
debugging wiki :)

------------------------------------------------------------------

[2018/10/23 09:27:39.123750,  3] 
../source3/smbd/smb2_server.c:3138(smbd_smb2_request_error_ex)

   smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1] 
status[NT_STATUS_OBJECT_NAME_NOT_FOUND] || at 
../source3/smbd/smb2_create.c:293


I am suggesting our Internet Security Software (Bitdefender) is causing 
this with some of its "features" - also contacting their support. But 
would be still interested in some hints for debugging help.

best regards,

Sascha