One of the user account getting locked out frequently in 2008R2 AD environment. I have checked the event log 4740 in PDC emulator server shows caller machine as share path \\10.1.7.180
10.1.7.180 is xen server 6.5 version not sure why caller machine pointing to the share path.
I deleted the saved credentials in user’s laptop and disconnected the old session in the servers upon that also user id getting locked out frequently.
Refer the net logon errors
2/23 08:21:48 [LOGON] CDDO: SamLogon: Transitive Network logon of (null)\John from \\10.1.7.180 (via server20) Entered12/23 08:21:48 [LOGON] CDDO: SamLogon: Transitive Network logon of (null)\John from \\10.1.7.180 (via server20) Returns 0xC0000234