Jun 17, 2014 05:04 PM|Siva Krishna Macha|LINK
Are you sure these two are pointing to the same server (IP) i.e.,
https://svr.mysite.com/app and https://svr1.mysite.com/app ?
Also check if you have configured domain names anywhere in IIS host settings.
A sample instruction how a host header might have been added into your IIS as follows from MSDN:
Open IIS Manager. For information about opening IIS Manager, see
Open IIS Manager (IIS 7).
In the Connections pane, expand the Sites node in the tree, and then select the site for which you want to configure a host header.
In the Actions pane, click Bindings.
In the Site Bindings dialog box, select the binding for which you want to add a host header and then click
Edit or click Add to add a new binding with a host header.
In the Host name box, type a host header for the site, such as
To add an additional host header, create a new binding with the same IP address and port, and the new host header. Repeat for each host header that you want to use this IP address and port.