Windows Server: Disabling SSL 3.0, TLS 1.0, and TLS 1.1
KB ID 0001675 What are these protocols? Both SSL and TLS are cryptographic protocols designed to secure communications over a network (remember the internet is just a network). Originally we had SSL version 1 and version 2. But they were, (to be honest) ‘a bit bobbins’ and full of security holes, so never really took off. Version 3 however did and was widely supported. The problem with version 3 was, (again) that was also ‘bobbins’....
Setup Cant Continue PowerShell Has Open Files
KB ID 0001633 Problem While attempting to uninstall Microsoft Exchange server; Setup can’t continue with the uninstall because the powershell (PID) has open files. Close the process, and then restart setup. Solution Seems to be a common error, and is usually caused because someone has the Exchange Web Management page open, (probably in another user session); In some cases you may need to reboot, but in my case I was simply being...
Exchange – Display Mailbox’s by size
KB ID 0000469 Problem Yesterday a client asked me how he could find out, which of his users were the “worst offenders” for mailbox size. Normally a simple Get-MailboxStatistics command would be fine, and we would sort the results in descending order. Solution On one of the Exchange servers, launch the Exchange Management Shell. Issue the following command: Note: That’s all one command, replace the name PNL-MAIL-2019...
Exchange Cant Mount Database ‘0x80004005’
KB ID 0001632 Problem When attempting to mount an Exchange Database I got this error; Failed to mount database “{Database-Name}”. Error: An Active Manager operation failed. Error: The database action failed. Error: Operation failed with message: MapiExceptionDatabaseError: Unable to mount database. (hr=0x80004005, ec=1108) Diagnostic context: Lid: 65256 Lid: 10722 StoreEc: 0x454 Lid: 1494 —- Remote Context Beg...
No Mail Flow On-Premises To/From Office 365
KB ID 0001631 Problem I upgraded my On-Premises Hybrid Exchange server recently, from Exchange 2016 to Exchange 2019. I remembered to add the new server onto the Office 365 send connector, but there was no mail flow between an on premises mailbox and an office365 mailbox? Solution This happens because, (even if you are using the same certificate on the new and old servers) the certificate that is used for TLS security between your...
Exchange 2013 – Working with and Managing the OAB
KB ID 0000745 Problem Exchange 2013, has changed the way Offline Address Books are handled, with previous versions only one server (the first server holding the mailbox role) was responsible for generating the OAB. With 2013 however multiple servers generate the OAB, In fact every server that has a special arbitration mailbox called an organization mailbox will create a copy. This is better for fault tolerance and resilience, and you...