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Multiple SPF records for one domain can cause problems in e-mail delivery
I have found, that on of my customer domains have problem to send messages outside their environment. Some messages got stuck in queue for several hours / days without any reason to do so. SMTP traffic...
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Exchange Error: Exception has been thrown by the target of an invocation
Microsoft Exchange error “Exception has been thrown by the target of an invocation” indicates issues for background process to modify the settings of existing mailbox object.In my case, I could not...
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Exchange Error: The handshake failed due to an unexpected packet format
A customer reported inoperative IMAP functionality for some user mailboxes. I checked all CAS servers and discovered the following issue with one of them: [PS] C:\>Test-ImapConnectivity...
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OWA, ECP virtual directory authentication malfunction, HTTP 500 error after...
This is just quick tip. If you get HTTP 500 error after upgrade to Exchange 2013 SP1, try to delete cache from your browser. Especially forms data. It helped in 100 percent of cases of OWA and ECP...
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Windows Server 2012+ and net-framework-core package installation error...
I have faced a problem with net-Framework-core package installation. As you probably know, this package is deprecated, but still available, when you specify source. It can be installed by command...
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Exchange 2013 CU5 – Organization preparation failure – An Active Directory...
When you run setup to upgrade Exchange server 2013, it checks prerequisites and one of its actions is to contact Active Directory to check schema version for possible need to update. In my case the...
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Outlook 2013 shows only Online Archive while connected to Office 365
This is just a quick heads up. It started to happen in some environments after last Office 2013 patch in mid January 2015. When Outlook 2013 is restarted after patching, it shows only Online Archive,...
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Exchange 2013,2010 – Event log analysis (Health Check part 1.)
I have created a database of common event log Errors and Warning generated on Exchange servers. Here is the list of Event IDs, description and its solution: EventID EntryType Source Message Action 4...
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Remote Migration And (500) Internal Server Error
Experience with Exchange 2010 based hybrid and the following remote migration failure (move requests/test cmdlet): Microsoft.Exchange.Migration.MigrationServerConnectionFailedException: The connection...
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Exchange Hybrid – 1 account and 2 mailboxes
I have just noticed an issue with Exchange 2010 based hybrid and AADSync. On-prem AD account has assigned on-prem mailbox as well as remote mailbox (Exchange Online – O365). Yes, it seems to be...
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