We have a piece of software that runs on a Windows Server 2008 box that appears to use a C++ API to send a NetSessionEnum request to our Samba PDC server. From what we can tell this should return a list of active sessions logged on the server.
NetSessionEnum does not appear to be working properly on the Samba server. This software logs the following error code:
11/01/2012 17:14:31,Warning,WebsenseDCAgent@x.x.x.x,XidDcAgent,WsWin32Net.cpp:120,0x20010001,The Windows system call NetSessionEnum returned an error for server DOMAIN\box. Error Code: 124
We did a packet capture to see what was going on and we observed an error message from the Samba server just after the NetSessionEnum request we was sent from the Windows machine. This is part of the packet capture:
SRVSVC NetSessEnum response, Error: WERR_UNKNOWN_LEVEL
On the Samba we can see the NetSessionEnum request come in and it is logged, but there doesn't appear to be any error messages associated with it. Here is a snippet from the log:
[2012/11/01 14:42:22.526710, 4] rpc_server/srv_pipe.c:1611(api_rpcTNP) api_rpcTNP: \srvsvc op 0xc - api_rpcTNP: rpc command: SRVSVC_NETSESSENUM [2012/11/01 14:42:22.526764, 3] rpc_server/srv_pipe_hnd.c:121(free_pipe_context)
We have managed to find a tool to test the NetSessionEnum here: Test app for NetSessionEnum
We get the same error when trying it against our Samba server:
Error: NetSessionEnum (124) The system call level is not correct.
Another update: We discovered that there are 5 levels at which a NetSessionEnum call can be made 0,1,2,10,502. Between the two applications we are testing with, one uses 10 and one uses 502 (as far as we call tell from the Wireshark captures). We know that both these levels fail when sent to a Samba server. Currently we have no way of testing levels 0, 1, and 2.
Can anyone shed some light on perhaps what might be causing this problem? We haven't been able to find to much information about the NetSessionEnum or how to test if it is configured properly. So we are having some problems doing further troubleshooting.
Any help or suggestions would be greatly appreciated!