Agent seems to fail on startup if timezone is different to OpenAM when using SSL

If I set up an agent and openam so that we are using native SSL to communicate then if we have the Agent Time Zone set to UTC (Dublin, Edinburgh, Lisbon, London) and OpenAM time set to UTC (Dublin, Edinburgh, Lisbon, London) then we get access to resources as expected.

So we have a working Agent/OpenAM configuration. (Using OpenAM 13.5 and Agent 4.1.0RC3)

Now we do the following steps

1)Change timezone to (UTC-08:00) Pacific Time (US & Canada) on Agent Machine
2)Restart IIS
3)Attempt to access a protected page

Expected Result
Access to page

Actual Result
We get a 503 service unvailable error

Additional Notes
-This issue does not occur for Windows 2008
-When IIS is restarted we get the application pool stopping
-There is no information available from logs
-When I tried with agent disabled then access was obtained to site suggesting it is not an IIS problem
-Also tried changing the time and this did not cause any problems - It seems that it is time zone which causes the issue.