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Computing Exchange Server HowTo Microsoft Windows

Fixing “No DKIM keys saved for this domain” in EOP and Office365

Sometimes a newly added domain in Microsoft EOP will not let you enable DKIM from the web user interface. The only workaround I know of is to prepare the domain using PowerShell. To connect a PS session to O365, I use the following script, ripped straight from Microsoft’s documentation: After waiting for an eternity for […]

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Computing HowTo Microsoft Windows

DNS/DHCP issues in modern Windows versions

Static IP addresses are a solid way to configure machines if you have few enough of them to manage them manually. But the more ability you want to have to change things on the fly, the more limiting such a configuration scheme becomes. Unfortunately I’ve had severe problems with getting servers with DHCP leases (or […]

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Computing HowTo Windows

FTP server on IIS

I recently had cause to set up an FTP server for internal use on a Windows server, and I bumped into an issue that took me a little while to figure out, since I had never done it before: I wanted to give a domain user account an isolated directory, and started out by creating […]

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Insanity Windows

Default behavior should not be stupid

I ran into a problem that truly surprised me yesterday: One of our remote desktop users accidentally deleted an entire folder of customer data. He was seriously angry, and rightfully so: He had pressed the Delete key on the keyboard at the wrong moment, after which the folder and its entire substructure was removed from […]

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Computing Exchange Server Microsoft Windows

Exchange – another lesson learned

This is why we test things before going live: After migrating a test box from the old Exchange environment, it could receive mail just fine, and sending mail out of the organization worked flawlessly too. Unfortunately any mail sent from this account to recipients within the old Exchange environment got stuck in the mail queue. […]

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Computing Exchange 2016 HAProxy Linux Windows

Load Balancing Exchange 2016 behind HAProxy

I recently started the upgrade to Exchange 2016 at work. A huge benefit over Exchange 2010, is that REST based client connections are truly stateless. In effect this means that if a server goes down, clients shouldn’t really notice any issues as long as something redirects them to a working server. In my system, this […]

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Active Directory Computing VMware Windows

The paravirtual SCSI controller and the blue screen of death

For driver reasons, the default disk controller in VMware guests is an emulated LSI card. However, once you install VMware Tools in Windows (and immediately after installing the OS in most modern Linux distributions), it’s possible to slightly lower the overhead for disk operations by switching to the paravirtual SCSI controller (“pvscsi”). I’m all for lower […]