Just be careful which time source you use. One of our servers was configured to use tick.usno.navy.mil and tock.usno.navy.mil back 10-15 years ago or so. The Navy had an "issue" with the time they were sending out. The overnight result was several licensing servers wouldn't authenticate and we were locked out of those systems(SSH needs accurate time, within minutes I believe). We discovered the discrepancy by logging in locally (we were in the same building but a different office) and changed the time servers and then the sync method to resolve the issue.