Shulou(Shulou.com)06/02 Report--

On Exchange 2016 Mailbox Server, add IIS IP and Domain Restrictions feature.

After adding, you can see that there is an additional "IP address and domain restriction" in the IIS option of OWA, as shown in the figure.

Then we add the IP address segment or domain name that needs to be restricted or allowed to the list, as shown in the figure.

Finally, restart IIS for the configuration to take effect.

If not, manually go to the service manager to start it.

Configure IPv4 Address and Domain Name Deny Rules (IIS 7) https://technet.microsoft.com/en-us/library/ddbeb893-ff7c-4336-ab2e-a5151dee8c9b

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