Group Won’t Accept Mail From ‘Outside’
Jan10

Group Won’t Accept Mail From ‘Outside’

KB ID 0001771 Problem Exchange has been this way for a long time here’s me explaining this very problem with older versions of Exchange. If you create a ‘Group’, be that a Distribution Group, or a ‘Microsoft 365′ Group, the default setting is to NOT ALLOW mail from anyone outside your organisation. If you attempt to send mail to that group you will see errors like these; Errors; 550 5.7.133...

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Can you Use ‘Let’s Encrypt’ on Hybrid Exchange?
Jan07

Can you Use ‘Let’s Encrypt’ on Hybrid Exchange?

KB ID 0001770 Problem A few months ago I wrote an article about getting free exchange certificates with Lets ‘Encrypt’. And that still works peachy, I implemented it on my test Exchange 2019 server (in Hybrid mode) and all appeared well.  Some time later, (remember this is my test network so it’s not in production.) I noticed that mail was not getting forwarded from O365 to the on premises Exchange server. I’ve...

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Exchange Y2KK Bug
Jan04

Exchange Y2KK Bug

KB ID 0001769 Y2KK Problem Over the last couple of days the Exchange forums have been alight with the Y2KK bug, typically it affects Exchange 2016 and 2019 (though the chatter is, it actually effects any Exchange versions whose update version begins with 22… This is fine below, (it begins with 21..) Add-PSSnapin Microsoft.Forefront.Filtering.Management.Powershell Get-EngineUpdateInformation Y2KK Symptoms  Emails No Longer Being...

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Exchange ECP HTTP 500 Error
Dec22

Exchange ECP HTTP 500 Error

KB ID 0001756 Problem This infuriatingly happens to me a lot! Every time the fix is the same, (but is a little impractical). Essentially you attempt to log in to ECP (Exchange Admin Center), you a prompted for your credentials, then you just get a ‘500 Error”.     The website cannot display the page   HTTP 500  Most likely causes: •The website is under maintenance. •The website has a programming error. What you can try:  ...

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A Reboot From a Previous Installation is Pending
Jul09

A Reboot From a Previous Installation is Pending

KB ID 0001755 Problem You may see the “A Reboot From a Previous Installation is Pending” error when either attempting to install Microsoft Exchange or apply a cumulative update, (which is basically a reinstall anyway!) You may also see this if you are only installing the management tools. At command line; A reboot from a previous installation is pending. Please restart the system and then rerun Setup. Or if you are running...

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Exchange Stopped Working?
Apr26

Exchange Stopped Working?

KB ID 0001749 Problem I see various posts in online forums, and the process is held up because a lot of techs can’t do basic troubleshooting on their Exchange deployments. So I thought I’d put together some basic ‘first steps’ for you to do when your  ‘Exchange Stopped Working’ This way you can at least get an error code to search for or a better idea of what’s going on. Exchange Stopped...

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