Mailflow issue from Exchange On-Prem to Office 365

You are on Exchange Hybrid environment and sending/receiving emails to/from Office 365 via specific Send Connector/Receive Connector which has TlsCertificateName attribute configured and EOP is doing certificate validation for Inbound/Outbound SMTP connections. You might see any of the following errors in the queue/Protocol Logs. –> 454 4.7.5 The certificate specified in TlsCertificateName of the SendConnector could not be…


When clicking new message in Outlook Web Access, Nothing happens.

When clicking new message in Outlook Web Access 2010, Nothing happens. It suppose to open new Message window to compose, however it does not happen however in Light OWA Mode it works fine. Resolution:- It happens due to some contents in the Signature which is causing it so you can remove/modify the signature from OWA, save…


Cross-Forest Free Busy with Shared Namespace

I’ve come across with certain implementations of Cross-Forest Availability service referring online documentations on this subject which includes a well written blog: How to Configure the Availability Service for Cross-Forest Topologies and a TechNet article: Configure the Availability Service for Cross-Forest Topologies. Being these articles talks all in and out of setting-up Availability service in…


Probe Exception: ‘System.Net.Sockets.SocketException (0x80004005): No connection could be made because the target machine actively refused it on Exchange Servers

You get following events in the Managed Availability Logs on Exchange 2013/2016. Log Name: Microsoft-Exchange-ManagedAvailability/Monitoring Source: Microsoft-Exchange-ManagedAvailability Date:  Event ID: 4 Task Category: Monitoring Level: Error Keywords: User: SYSTEM Computer:  Description: The client submission probe failed 3 times over 15 minutes. No connection could be made because the target machine actively refused it Probe…


ReadReceipt on Active Sync Device

Starting from Exchange 2016, now you can disable Read Receipt Feature on Active Sync Device through cmdlet. Default Output would be: Get-CASMailbox <User> | fl ActiveSyncSuppressReadReceipt ActiveSyncSuppressReadReceipt : False You can set it $Ture and it will change following option in Outlook Web Access as well. Set-CASMailbox <User> -ActiveSyncSuppressReadReceipt $True    

Unable to see Free Busy through Exchange Federation

You receive following error while fetching free Busy for another Federated Organization and get following error from Exchange On-perm servers. [PS] C:\>Test-FederationTrust RunspaceId : 49c3c312-1a26-4cd8-a14d-59d736458f76 Id         : FederationTrustConfiguration Type       : Success Message    : FederationTrust object in ActiveDirectory is valid.  RunspaceId : 49c3c312-1a26-4cd8-a14d-59d736458f76 Id         : FederationMetadata Type       : Error Message    : Unable to retrieve federation metadata…

Exchange 2010 SP3 RU16 update fails with error code 2771

Exchange 2010 SP3 RU16 update fails with following error. Log Name: Application Source: MsiInstaller Date: ******* Event ID: 10005 Task Category: None Level: Error Keywords: Classic User: ******* Computer: ******* Description: Product: Microsoft Exchange Server — The installer encountered an unexpected error while installing this package. This may indicate a problem with this package. The error code is 2771….

EdgeSync service cannot connect to this subscription because of error “The LDAP server is unavailable”

You configure the EdgeSynchronization in the Exchange 2010 environment but having issues with edge sync and getting following events on the HUB servers. Log Name:      Application Source:        MSExchange EdgeSync Date:          ******** Event ID:      1024 Task Category: Topology Level:         Error Keywords:      Classic User:          N/A Computer:      ********** Description: Failed to connect to the…

Exchange Server 2016 and Office Online Server Process Flow

Here is the process flow of how Exchange Server handles attachments when integrated with Office Online server. Exchange uses discovery URL to ask Office Online Server which files types it can view and edit. Office Online Server returns table of supported file types. User opens mail with attachment that matches one of the file types Office…

Cannot enable UM for users

You cannot enable UM (Unified messaging) feature for users and get following errors. Enable-UMMailbox -Identity <> -UMMailboxPolicy <> -Extensions <> -PinExpired:$true -SipResourceIdentifier <> Exception: Mailbox <> couldn’t be initialized for Unified Messaging: There was an error accessing the mailbox using EWS. The requested operation failed with ResponseCode “ErrorInternalServerError”. Details : An internal server error occurred….