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Are you using a trusted certificate or a self signed certificate?<br />
If a trusted certificate get the SSL provider to reissue it. It could be corrupt. Most providers will do a rekey for free.<br />
<br />
Simon.
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Are you using a trusted certificate or a self signed certificate?
If a trusted certificate get the SSL provider to reissue it. It could be corrupt. Most providers will do a rekey for free.

Simon.

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Its self signed certificate.
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That's what I was thinking. Not sure though if that would resolve it.
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That's what I was thinking. Not sure though if that would resolve it.

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I have reissued self signed certificate and seems external side start working. I will buy SSL certificate for this for future. You are right less headache.
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I have reissued self signed certificate and seems external side start working. I will buy SSL certificate for this for future. You are right less headache.

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After couple restarts Mail server with &nbsp;Exchange 2007 started having issues with OWA with NTLM authentication. &nbsp;Internally all users can connect to it within Outlook. Externally Outlook complains about certificate. First error I have seen was code 2. When I removed already installed &nbsp;certificate that was on computer I was using Outlook and re-add it then error code 8 appears saying the Certificate is invalid. There were no changes to any of the certificates and only one certificate is installed on the mail server. <br />
I have involved Microsoft but so far no luck with them. <br />
Server is Windows 2003 R2 and Exchange 2007 SP3 Rollup 12.
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After couple restarts Mail server with  Exchange 2007 started having issues with OWA with NTLM authentication.  Internally all users can connect to it within Outlook. Externally Outlook complains about certificate. First error I have seen was code 2. When I removed already installed  certificate that was on computer I was using Outlook and re-add it then error code 8 appears saying the Certificate is invalid. There were no changes to any of the certificates and only one certificate is installed on the mail server. 
I have involved Microsoft but so far no luck with them. 
Server is Windows 2003 R2 and Exchange 2007 SP3 Rollup 12.

OWA stopped working for remote users

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.