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Chris Allen's (CHALLEN) Exchange Blog

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What is KeepAliveTime used for in regards to Exchange?

This one setting has caused more debates and more confusion, and by proxy, more cases than perhaps...

Date: 04/15/2017

How did that 1.5GB message get into my Exchange environment anyway?

ISSUE: Recently, I had a customer call in an issue where their transport services were failing on...

Date: 04/15/2017

Owaproxy component is in Inactive State and will not successfully activate

ISSUE: My customer put their Exchange 2016 environment into maintenance mode so they could apply...

Date: 04/14/2017

Mailbox migration times out when going from Exchange OnPrem to O365

ISSUE: When attempting to migrate an onPrem User mailbox from Exchange 2013 to O365, the following...

Date: 04/14/2017

Mail not routing to on-premise Exchange 2013 environment from O365 with 450 4.7.320 Certificate validation failed error

Issue: User is trying to send email from his O365 Tenant in to the OnPrem Exchange 2013 environment....

Date: 04/14/2017

Email destined for recently moved Modern Public Folders are going to the Poison queue.

Scenario I recently worked a case where the customer had moved all of the public folders from one...

Date: 02/01/2017

O365 Migration that completes with warnings due to insufficient rights.

The Problem: With the rise in Hybrid configurations around the world, we are starting to see some...

Date: 01/27/2017

Only seeing first receive event when doing message tracking against a public folder that was migrated to O365 from Legacy Exchange

In Exchange 2010 and older (legacy exchange), when you migrate a public folder to O365, it makes a...

Date: 08/25/2016

Event 1035, MSExchangeTransport - Inbound authentication failed with error UnexpectedExchangeAuthBlob for Receive connector

Scenario Ran into an interesting case today where mail flow had quit working in one direction...

Date: 08/24/2016

1007 AccessDenied: Access Denied when trying to renew Federation Certificate

The 1007 AccessDenied event is usually tied to a time skew issue and that should always be confirmed...

Date: 07/27/2016

Shared Free/busy between two untrusted forests failing in one or both directions

In a recent case, I found a pretty common mistake many customers make when setting up their...

Date: 07/15/2016

Unable to expand legacy onPrem Public Folders with O365 account

I have been seeing a few scenarios lately where users who log into Exchange using an account other...

Date: 06/21/2016

Microsoft Filtering Management Service won't start on Exchange 2013

Issue In a recent case, the transport service on an exchange 2013 server was failing to start due to...

Date: 02/18/2016

Mitigating Mail Loops when using Auto Reply in Exchange 2010

Symptoms When you enable Auto Reply for the Default(*) Remote Domain in Exchange 2010, you are...

Date: 02/17/2016

Moving Queue Database to a Different Exchange Server

Recently, a customer asked me if there was a way to bulk move all of a pending queue from one server...

Date: 02/06/2016