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“Anonymous Access” should be enabled in IIS on the EWS virtual directory.
Check DNS Settings
SRV Record:
Service: _autodiscover
Protocol: _tcp
Port Number: 443
Host: mail.domain.com
A Record: autodiscover.domain.com point to mail.domain.com
SAN entry for Autodiscover in Exchange Server.
Modify local host file (To test the issue temporary)
- Go to: %systemdrive%:\Windows\System32\drivers\etc\
- Open host file with notepad.exe
- Add exchange server IP records.
Eg:
<ExchangeSvrLocalIP> ex1.domain.com
192.168.1.10 ex1.domain.com
<PublicIPAddress> ex1.domain.com
XXX.XXX.X.XXX ex1.domain.com
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