Windows Server 2012 R2 change from GUI to Core and exchange's OWA and ECP is not working. PC in the same network can access email send/receive no issue but only OWA and ECP having issue. Please Help. i tried to recover the GUI interface using add-windowsfeature
Server-Gui-Mgmt-Infra and it installed successfully before restart, once restart it will show Failure configuring windows features, reverting changes. then it shows Core version again.
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