The NPAC and LSMS system times must be within five minutes of each other, with the NPAC serving as the master. If the NPAC and LSMS system times are not within five minutes of each other, one of the following GUI notifications may be posted:
[Critical]: <Timestamp> 2003: NPAC [<PRIMARY|SECONDARY>] Connection Aborted by PEER : Access Control Failure
[Critical]: <Timestamp> 2012: NPAC [<PRIMARY|SECONDARY>] Connection Attempt Failed : Access Control Failure
If one of these notifications appears, verify and, if necessary, reset the LSMS time using the methods described in either of the following sections:
Automatically Controlling the LSMS Time Using NTP. Using the Network Time Protocol (NTP) requires access to accurate NTP servers, but results in the LSMS rarely, if ever, being out of synchronization with the NPAC. This section describes how to troubleshoot the rare problems with NTP.
Manually Controlling the LSMS Time Without an External NTP Source. Using only manual methods to control the LSMS time can result in cases of the LSMS being out of synchronization with the NPAC.