Since I have partitioned my Mac's internal disk and installed on one partition Mavericks and the second partition Yosemite, I can now inspect the logfiles of the failing Yosemite installation. The log file which attracted my attention was 'accountpolicy.log'. I could exactly see when it went wrong yesterday. Although not all at the same time but within a day all accounts get the following log entry
Dec 19 00:22:55 (45.4) AuthenticationAllowed completed: record "<<user1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
My Mac is registered with a Mac OS X server at home via Profile Manager and when I read "ProfilePayload" this looks related to Profile Manager. I have indeed specified a maximum of 5 failed login attempts. However, I would expect this counter to revert to 0 each time you have a successful login. Can someone confirm what the behaviour I should expect?
Since I registered my Mac earlier this week only, this might explain why the issue started now and not earlier.
I can change the policy myself but I'm not sure whether you have to be logged in for policies to be updated or whether simply starting up and having access to the login screen is sufficient.
For completeness I'm also posting the last successful and first unsuccessful attempt:
Dec 17 19:02:23 (45.10) SecondsUntilPasswordExpires completed: record "<<user1>>", result: never expires.
Dec 17 19:02:27 (45.11) AuthenticationAllowed completed: record "<<user1>>", result: Success (0).
Dec 17 19:02:27 (45.12) AuthenticationAllowed completed: record "<<user1>>", result: Success (0).
Dec 17 19:02:27 (45.13) AuthenticationAllowed completed: record "<<user1>>", result: Success (0).
Dec 17 19:02:28 (45.14) AuthenticationAllowed completed: record "<<user1>>", result: Success (0).
Dec 17 19:04:20 (45.15) AuthenticationAllowed completed: record "<<user1>>", result: Success (0).
Dec 17 19:04:20 (45.16) AuthenticationAllowed completed: record "Guest", result: Success (0).
Dec 17 19:04:20 (45.17) AuthenticationAllowed completed: record "<<admin1>>", result: Success (0).
Dec 17 19:04:20 (45.18) AuthenticationAllowed completed: record "<<admin2>>", result: Success (0).
Dec 17 19:04:21 (45.19) AuthenticationAllowed completed: record "Guest", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 17 19:04:21 (45.20) AuthenticationAllowed completed: record "<<admin1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 17 19:04:21 (45.21) AuthenticationAllowed completed: record "<<user1>>", result: Success (0).
Dec 17 19:04:21 (45.22) AuthenticationAllowed completed: record "<<admin2>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 18 17:20:17 Account Policy Helper agent starting
Dec 18 17:20:17 (45.1) AuthenticationAllowed completed: record "Guest", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 18 17:20:17 (45.2) AuthenticationAllowed completed: record "<<user1>>", result: Success (0).
Dec 18 17:20:17 (45.3) AuthenticationAllowed completed: record "<<admin2>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 18 17:20:17 (45.4) AuthenticationAllowed completed: record "<<admin1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 18 17:20:17 (45.5) AuthenticationAllowed completed: record "<<admin2>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 18 17:20:17 (45.6) AuthenticationAllowed completed: record "<<user1>>", result: Success (0).
Dec 18 17:20:17 (45.7) AuthenticationAllowed completed: record "<<admin1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 18 17:20:17 (45.8) AuthenticationAllowed completed: record "Guest", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:22:55 Account Policy Helper agent starting
Dec 19 00:22:55 (45.1) AuthenticationAllowed completed: record "Guest", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:22:55 (45.2) AuthenticationAllowed completed: record "<<admin1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:22:55 (45.3) AuthenticationAllowed completed: record "<<admin2>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:22:55 (45.4) AuthenticationAllowed completed: record "<<user1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:22:56 (45.5) AuthenticationAllowed completed: record "<<admin1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:22:56 (45.6) AuthenticationAllowed completed: record "<<admin2>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:22:56 (45.7) AuthenticationAllowed completed: record "<<user1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:22:56 (45.8) AuthenticationAllowed completed: record "Guest", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:23:00 (45.9) AuthenticationAllowed completed: record "<<user1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:23:00 (45.10) SecondsUntilPasswordExpires completed: record "<<user1>>", result: never expires.
Dec 19 00:23:05 (45.11) AuthenticationAllowed completed: record "<<user1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:23:42 (45.12) AuthenticationAllowed completed: record "<<admin1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".
Dec 19 00:23:42 (45.13) SecondsUntilPasswordExpires completed: record "<<admin1>>", result: never expires.
Dec 19 00:23:55 (45.14) AuthenticationAllowed completed: record "<<admin1>>", result: Failed Authentication Policy (-47102), Failed global policy "ProfilePayload:d3395090-1294-012f-4d37-482a1455fa5c:maxFailedAttempts".