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Network Discover cannot connect to the Microsoft Exchange Autodiscover service over HTTP
Article ID: 162012
Data Loss Prevention EnforceData Loss Prevention Network Discover
If you have enabled the Advanced Server Setting Discover.Exchange.OnlyUseSecureHttpConnections, the Network Discover detection server cannot connect to the Exchange Autodiscover service over HTTP."The Exchange Autodiscover service is not available for <mailbox>. See your Exchange documentation for details on how to resolve this."
Configure your Exchange Autodiscover service to connect over HTTPS.