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Suddenly it will come out the below error when accessing the exchange 2010 mail server using OWA after clicking sign in button on initial page?

***The website cannot display the page HTTP 500
Most likely causes: •The website is under maintenance. •The website has a programming error.

What you can try: Refresh the page.

 Go back to the previous page. 

 More information 

This error (HTTP 500 Internal Server Error) means that the website you are visiting had a server problem which prevented the webpage from displaying. For more information about HTTP errors, see Help.*

Any suggestion? Thanks!

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On the exchange server, check the services list to check if all related services are running. If not, check the event log as to why they won't run.

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You could also try the brilliant Test-ServiceHealth cmdlet. – Ben Pilbrow Jan 24 '11 at 23:43

I was having this same issue and the Microsoft Exchange Forms-Based Authentication Service failed to automatically start. As soon as I started up this service, OWA started working again.

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Most likely, you are running SBS Server. Go to Services and start Microsoft Exchange Forms-Based Authentication service.

Hope this helps, from some one who has the same problem.

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Microsoft Exchange Forms-Based Authentication Service. Starting this service fixed the blank page issue and allowed clients to authenticate correctly.

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