OWA stopped working both internally and externally on Exchange 2010 (SBS 2011)

Outlook Web App has suddenly stopped working. All that is shown is 'page cannot be displayed'. Tried a number of fixes already including:

Restarting all necessary services
Rebooting the server
Resetting virtual directory
Checking permissions on the wwwroot directory
Checked DNS records/IP of OWA
Basic IIS troubleshooting

Ash GhaiManaging DirectorAsked:
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So there were no changes at all to your servers?  Any virus updates, any firewall changes, anything?
Shreedhar EtteCommented:
Go to default web site - Right Side Click on Binding and verify a proper certificate as been assigned to 443 bindings.

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Ash GhaiManaging DirectorAuthor Commented:
Solved the problem, thank you!
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