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Title
Free busy working intermittently from Exchange to Domino -
Description
Free busy requests failing ocasionally only from Exchange to the Domino environment.
Requests beind made between OnPrem and Online and vice versa are working correctly.
Requests from Domino to Exchange are also working correctly.
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Cause
When doing a lookup for free/busy information, the Exchange servers within Office 365 will do a lookup to :
https://autodiscover.domain.com/autodiscover/autodiscover.svc/WSSecurity
Assuming that autodiscover.domain.com is the published AutoDiscover url.
We may come across issues on this lookup depending on the configured environment.
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Resolution
Rather than letting Autodiscover figure out the endpoint, we can assign the TargetSharingEPR attribute in the Organizational Relationship (Exchange Online) to point to the externally published EWS url, example:
https://mail.domain.com/ews/exchange.asmx