Microsoft.Exchange.InfoWorker.Comm on.Availability.AutoDiscoverFailed Exception: A cross-forest Availability service that can fill request for mailbox <ASD2>

Geting following error in both forest CAS servers 

Exchange 2007 is used in ABC.com forest and exchange 2010 is used in xyz.com forest.

Two-way direction truth is configured between both forest.

Recently our Exchange 2007 is used in ABC.com forest CAS certificate expired. We had change with other certificate but the name of site and certificate is different. So we had change the urls of all CAS webservices such as OWA,Autodiscover except active sync.

Event ID: 4001 category:Availability Service  Source: MSExchange Availability Type: Error. 

Process 8344[w3wp.exe:/LM/W3SVC/1/ROOT/EWS-1-130848839633268198]: Microsoft.Exchange.InfoWorker.Common.Availability.ProxyWebRequestWithAutoDiscover failed. Exception returned is Microsoft.Exchange.InfoWorker.Common.Availability.AutoDiscoverFailedException: A cross-forest Availability service that can fill request for mailbox <ASD2>SMTP:ASD2@xyz.com could not be found.. This event may occur when Availability Service cannot discover an Availability Service in the remote forest.

August 26th, 2015 10:48am

Have you configured cross-forest federation with the Microsoft Federation Gateway?  If so, I believe you'll have to reestablish both the MFG trust and the organization relatio

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August 26th, 2015 12:39pm
We have not configure MFG for cross-forest. We have only perform active directory cross forest bi-directional.
August 27th, 2015 4:31am
Okay, please share how you configured this in detail.
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August 27th, 2015 5:02pm
can u pls tell me what details u need or me know the command i will share the results with u.
September 9th, 2015 12:51pm

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