For restrict Outlook Web Access (OWA) from the internet follow below simple steps.
- Install “IP and Domain Restrictions” server sub role in Web Server > Security.
- Open IIS Manager and Go to Default Web Site > owa > IP Address and Domain Restrictions.
- Add Allow Entry/entries from Actions view. Add your local network sub nets in here.
Add Deny Entry for unspecified clients.
That’s it.
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