Wenwu, > I have checked time and it is very accurate on both machines. How small > the time difference ldm can tolerance? Anything less than 30 seconds should be OK. We strongly recommend, however, that LDM hosts run the Network Time Protocol daemon (ntpd) to ensure millisecond accuracy. > Any other things I have to check? > The data missing is not very often. What version of the LDM are you running? Regards, Steve Emmerson Ticket Details =================== Ticket ID: QOQ-440372 Department: Support LDM Priority: Normal Status: On Hold