Hi All,

I have installed OWA 2013 for SharePoint 2013 in a Farm and the same has been connected to the SP Farm. I'm able to access the OWA from all the SharePoint sites in the Farm, but the sites which are added to the Host header in the IIS causing this issue. 

Note: All the sites are Internal and for few of the sites are IIS Host Header Mapped sites.. 

Thanks in advance for your suggestions!

I recommend you post your question in a SharePoint forum.  I'm sorry, but I don't have a link handy to the SharePoint forums.

Hi,

As far as I know, you have post this question in SharePoint forum. Please follow your issue in SharePoint forum, I appreciate your understanding.
Just as additional, SharePoint 2013 will not be aware of these changes and will not automatically update your IIS bindings to match. We have to update the URL or IIS bindings of a web application, unextend and reextend the web application and reconfigure the alternate access mapping URLs or IIS website bindings. For your reference: https://technet.microsoft.com/en-us/library/cc262366.aspx?f=255&MSPPError=-2147217396

Thanks

Hi Allen,

Thanks for your response! 

I would follow your suggestions and try to figure out the root cause of the issue.