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…


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…


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….


Mailflow issue from Exchange On-Prem to Office 365

You are on Exchange Hybrid environment and sending emails to Office 365 via specific SendConnector which has TlsCertificateName attribute configured and EOP is doing certificate validation for Inbound 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 found….


SMTP Folders in IIS 6

When you install the SMTP service it creates the following default folders in order to process mail: The folder C:\inetpub\mailroot\ contains 4 folders; Badmail, Drop, Pickup & Queue. Pickup: The SMTP service will process messages in the Pickup folder as outbound messages and will attempt to deliver them. Drop: Incoming messages intended for the local domain are placed in the Drop folder….


Exchange Federation Certificate is Expiring Soon?? Don’t Worry

Here are the steps to renew the Exchange Federation certificate if its going to Expire soon. • Create a new federation certificate following the steps below: $ski = [System.Guid]::NewGuid().ToString(“N”) New-ExchangeCertificate -FriendlyName “Exchange Federated Sharing” -DomainName $env:<> -Services Federation -KeySize 2048 -PrivateKeyExportable $true -SubjectKeyIdentifier $ski • Configure the federation trust to use the certificate with the provided…


Remove-EdgeSubscription : Can’t make this change because the object’s ExchangeVersion property is 0.20 (

We get error while removing Edge Synchronization from Exchange 2010 Edge servers. Remove-EdgeSubscription : Can’t make this change because the object’s ExchangeVersion property is 0.20 (, which is not supported by the current version 0.1 (8.0.535.0). You will need a newer version of Exchange to make this change. Remove-EdgeSubscription removes both the subscription and any…