[jcifs] client disconnects when lmcompatibility set to 5

Jimmy Young youj at yahoo.com
Tue Mar 2 14:26:59 MST 2010

Hi experts,

I am using j-interop which uses jcifs for DCOM communication.
I've been testing with 1.2.19 and 1.3.14.

The server is a Windows box and the client is a linux box.
A local acount is used for authentication. The client is constantly read data 
from server in about 1 Hz rate.

When the lmcompatibility at server is set to 3, everything works fine.

When the lmcompatibilty is set to 5, the client connects to server fine and 
read data successfully initially. After sometime, the server DCOM log will say 
the client disconnects. Our code will re-connect after disconnection.

Examining the server event log, there is "logoff" message at multiple of 4 
minutes interval. It does not happen every 4 minutes. It happens at sometime 4 
minutes or 8 minutes, and etc.

Logon Failure:
 	Reason:		Unknown user name or bad password
 	User Name:	opcclient
 	Domain:		MY.DOMAIN.ORG
 	Logon Type:	3
 	Logon Process:	NtLmSsp 
 	Workstation Name:	JCIFS121_210_A9
(This is Microsoft explanation of the event.
Consider the following scenario. A Microsoft Windows Server 2003-based member 
computer is joined to a domain controller. In the domain controller, the audit 
policy is turned on for logon failures. When a local user on the member 
computer logs off, the following event is logged in the Security log in the 
domain controller:

What could cause this disconnection? The connection is being used constantly.

Now the second question. After we re-connect to server, the lsof showed left 
over pipes on the client box.
< java      18791   console  108r     FIFO        0,6             5053914 pipe
< java      18791   console  109w     FIFO        0,6             5053914 pipe
< java      18791   console  110r     0000       0,11        0    5053915 
< java      18791   console  111r     FIFO        0,6             5053916 pipe
< java      18791   console  112w     FIFO        0,6             5053916 pipe
< java      18791   console  113r     0000       0,11        0    5053917 

Eventually "too many files open" error occurs and forces us to shutdown the 

Any help is very much appreciated.
I'll be happy to provide wireshark capture file if needed.
Please provide the filter if any.


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