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All Posts (553)

• 

  Published on

  2026-01-20 3:45 a.m.

  Authors

  Koskila

  Tags

  outlookmicrosoft365

  How to edit members in a M365 Group or Distribution list?

  Stop sending mail to the wrong people because Microsoft buried the controls behind two completely different and hidden UIs. This guide shows how to edit members of M365 (Unified) Groups and classic Distribution Lists using Outlook Web and the Exchange admin center, safely and without accidentally granting Teams or SharePoint access to your entire vendor list.

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• 

  Published on

  2026-01-13 6:26 a.m.

  Authors

  Koskila

  Tags

  aksazure

  What do you do when AKS randomly changes IP address?

  A working service can stop answering overnight when the IP beneath your AKS ingress changes — and when DNS records or firewall rules depend on that address, the fallout can be immediate and painful! This article explains why AKS sometimes changes public IPs, how to tell whether your cluster uses a single address or separate inbound/outbound addresses, and practical steps to prevent surprises or recover quickly when the IP does change.

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• 

  Published on

  2026-01-06 2:33 p.m.

  Authors

  Koskila

  Tags

  blazoryearreviewwordpress

  Copilot, Blazor, and a Mac Mini in a Pear Tree — koskila.net in 2025

  It’s that end‑of‑year ritual again — a short pause to look back at what actually happened, what broke, and what was surprisingly useful. This year mixed wins with plenty of frustration: Frustration with unreliable hardware and Windows, cold start with macOS, the challenge of balancing family, work, and personal projects with speaking at conferences again; and of course the ongoing learning path with agentic software development.

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• 

  Published on

  2025-12-30 4:14 a.m.

  Authors

  Koskila

  Tags

  windowswindows11dell

  My 2025 Holiday Special - Windows 11 set-up fun!

  My Windows 11 machine decided to go belly up just before Christmas, so I got to have some fun reinstalling Windows from scratch. I was hoping for a MacBook Pro for Christmas, but alas - it seems that Satan got me a fresh Windows installation to deal with instead. In this article I'll describe what happened and share my experience setting up a fresh Windows 11 installation — it wasn't pleasant. Maybe this will serve as feedback for Microsoft to improve the Windows setup experience.

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• 

  Published on

  2025-12-23 9:05 a.m.

  Authors

  Koskila

  Tags

  clipchampmicrosoft-teamsmicrosoftstreamoffice365videosharepoint

  Sharing your meeting recordings has never been more... Confusing!

  This is not my typical blog post, where I introduce a problem, talk a little bit about the background, dive in to the technical stuff, rant for a while and then explain how to get around the issue (or even fix it!) No - this time, in the spirit of ranting, I'm just venting. Well, and in the process I do share what actually does work - so I guess it IS a normal blog post after all. But it IS rantier than usual. You have been warned!

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• 

  Published on

  2025-12-16 4:22 a.m.

  Authors

  koskila

  Tags

  dotnetcertificates

  How to ignore SSL validation errors in a HttpClient in C#?

  SSL certificates - some days they'll give your end users that false sense of security that only a beautiful green lock icon can bring, and some other days they'll throw you in a world of pain because one randomly expired and hence the API you use to update your certificates is now inaccessible.

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• 

  Published on

  2025-12-09 4:30 a.m.

  Authors

  Koskila

  Tags

  azcliazureazurecliwindows

  How to fix "Decryption failed: Key not valid for use in specified state" in Azure CLI?

  Ever thought Azure CLI was your reliable sidekick on Windows? Ha! You'd think so, until "Decryption failed: Key not valid for use in specified state" hits you out of nowhere. Fear not, though; for this is not just another Windows woe, but instead another fun trip down the rabbit hole that is authentication in the Microsoft world!

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• 

  Published on

  2025-12-02 3:57 a.m.

  Authors

  koskila

  Tags

  akscertificateskubernetes

  How to replace the default certificate in AKS?

  Ah, the joys of Kubernetes wrangling – where even a "simple" cert swap feels like herding a bunch of ferrets on meth through a YAML labyrinth. Or so I've been led to believe by local ferret owners, when I tell them about my adventures with AKS. Anyway - this article explains how to replace the default certificate on an AKS cluster's ingress controllers.

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• 

  Published on

  2025-11-25 7:12 a.m.

  Authors

  Koskila

  Tags

  dotnetmacoswindows11dell

  Windows Juggernaut vs. a Cheap Mac: Speed Comparison

  Ever wondered if shelling out for a top-tier Windows laptop really delivers the bang for your buck in development speed, or if a budget Mac mini could punch above its weight? Stop wondering, and start reading, because I've got the answers for you. As someone who's juggled both - a 4000 USD developer laptop (Dell XPS 14 with insane specs) and a 750 USD Mac mini that cost a fraction - I put them head-to-head in build speed tests.

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• 

  Published on

  2025-11-18 3:46 a.m.

  Authors

  Koskila

  Tags

  bitlockerrefstroubleshootingwindowswindev

  How to fix a ReFS Dev Drive on Windows?

  Ever tried editing a file on your ReFS Dev Drive only to get "This media is write-protected" or "unexpected error code 19"? Welcome to the non-deterministic future of operating systems, where a sneaky update or a rogue policy can all but brick your drive - while tools like diskpart and chkdsk claim there's nothing wrong. Buckle up for the failures: takeown/icacls flops, registry tweaks do nothing, and ReFS's locked metadata mocks NTFS fixes. The real culprit?

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• 

  Published on

  2025-11-11 2:27 p.m.

  Authors

  koskila

  Tags

  aspnetcoreblazorseoBlazorStatic

  How to make Blazor Static support trailing slashes in URLs?

  Oh, Blazor Static - the dazzling, lightning-fast static site generator that turns your Blazor components into HTML gold. One of the rare pieces of tech that makes me happy day after day that I'm using it for my static sites. Too bad it's a real diva when it comes to URLs! Stubborn enough to refuse to serve /about/ when /about works just fine. And sure - it's not really the library's fault. There is no server-side routing to handle the redirection between the two URL styles.

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• 

  Published on

  2025-11-04 8:10 p.m.

  Authors

  Koskila

  Tags

  copilotghcpgithubmarkdown

  Using *instructions.md to encourage GitHub Copilot to behave

  Ever wished GitHub Copilot could read your mind (or at least your repository's README)? You're not alone - it's time to turn your AI assistant into a well-behaved coding partner, who actually does what you want. Say "NO!" to more random changes and weird side paths. Let's learn how to customize Copilot's behavior so it aligns with your project's quirks and keeps the code fresh.

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• 

  Published on

  2025-10-28 3:38 a.m.

  Authors

  Koskila

  Tags

  M365VivaEngageYammer

  "Share to Yammer" truly is gone - what's next?

  This article explains what happened to the "Share to Yammer" button, which was discontinued at the end of Q2 2025, and what you can do now. The historical context Yammer was acquired by Microsoft in 2012. At that time, Yammer was a popular enterprise social networking service, and Microsoft integrated it into its suite of productivity tools. Well, "integrated" might be a strong word. More like "added it to marketing materials". But I digress.

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• 

  Published on

  2025-10-21 2:37 a.m.

  Authors

  Koskila

  Tags

  ESUmicrosoftwindows-10windowsupdate

  Extend Your Windows 10 Experience for Another Year 🥰

  This article explains how you can keep using Windows 10 for another year, even though Microsoft has officially ended support for it. Background (rant) I'm not going to lie - right now I would not buy a Windows computer. It just feels like a risk you don't need to take. And I would know! I have bought 3 Windows machines in the last 3 years, costing me (or my employer) 4000, 2500 and 750 euros respectively.

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• 

  Published on

  2025-10-14 2:00 a.m.

  Authors

  Koskila

  Tags

  kqlmanaged-metadatasharepointsharepoint-search

  How to query a term + children in SharePoint Search (KQL)?

  In this article, I'll get back to basics of KQL in SharePoint Online's Search Service, and explain how to target a Managed Metadata term and its children. Maybe everyone else just remembers how to do this straight off the bat, and how the service behaves in different scenarios... But I don't. And googling gave me a bunch of low confidence results. Which I had very low confidence in. So here we are. I needed to try this out again, and document it for future reference.

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• 

  Published on

  2025-10-07 1:34 a.m.

  Authors

  Koskila

  Tags

  BIOSdelltroubleshooting

  LEDs Are Blinking But Nobody's Home - Dell XPS 15

  This article explains how to diagnose and fix a Dell XPS 15 laptop that won't start, indicated by blinking LED lights. It includes a list of blink codes and a step-by-step guide to resetting the BIOS. And a lengthy rant about Dell and the state of Windows laptops in 2020s 🙃 Background Ah, Dell XPS 15, my favorite laptop to hate on. 1.5 years of a love-hate relationship, with very little love and a lot of hate. Don't get me wrong. I have loved Windows since I first got started on Windows 3.11.

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• 

  Published on

  2025-10-03 11:28 a.m.

  Authors

  Koskila

  Tags

  authenticationdotnetsapsuccessfactors

  How to authenticate against SAP SF OData endpoints in .NET?

  This article explains how to obtain OAuth access tokens for SAP SuccessFactors OData endpoints using the SAML 2.0 Bearer Assertion flow. I wouldn't normally write about SAP. It's one of the TLAs that gives me shivers, and I'd rather stay away from it. But the corporations do love it - almost as much as they love Workday - so deal with it we must! I'd also normally post my articles on Tuesdays - but this one was so painful to finish that it'll roll out when it's done.

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• 

  Published on

  2025-09-23 10:41 a.m.

  Authors

  Koskila

  Tags

  m365microsoftoffice-365PeopleSkillsvivaSkillsInViva

  M365 Skills are all over the place again - what's good?

  This article explains the weird history of the M365 Skills offering, which has been renamed and rebranded more times than I can count. If you want the TL;DR - skip the history and jump to the "What do you need to know about People Skills in M365?" section.

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• 

  Published on

  2025-09-16 2:44 p.m.

  Authors

  Koskila

  Tags

  M365AgentsSDKmicrosoft-teamssessions

  At Teamsdagen? Come say hi!

  Helloooooooo Stockholm! Are you coming to Teamsdagen on 17th of September? Because you probably should! Teamsdagen is Sweden's premier conference dedicated to Microsoft Teams, bringing together experts, innovators, and enthusiasts for a couple of days full of inspiring keynotes, hands-on workshops, and networking opportunities.

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• 

  Published on

  2025-09-15 6:17 p.m.

  Authors

  Koskila

  Tags

  M365AgentsSDKsessionsteamstoolkitm365

  CollabDays Finland 2025 was great - get the slides and demos here!

  CollabDays Finland/Helsinki was last week, and boy was it an interesting trip! I feel super fortunate having the opportunity to do some fun traveling for work, and the privilege to speak and meet people at these community events. I was presenting a session with Gautam Sheth, an old friend from the fabled Valo days. We talked about our experiences (and challenges) with the M365 Agents SDK, and how to build M365 Copilot extensions with it.

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• 

  Published on

  2025-09-09 3:20 p.m.

  Authors

  koskila

  Tags

  m365M365AgentsSDKmicrosoft-teamsmicrosoft365teamsfxteamstoolkit

  Why M365 Agents SDK Should Be on Your Radar

  This article explains some of the pros and cons of the M365 Agents SDK: The ambitious successor to Teams Toolkit, and why you should care about it. I'm also sharing some of my and my peers experiences developing with it. Background Microsoft really, really REALLY wants to be THE Enterprise AI company, and place Copilot as the UI for AI.

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• 

  Published on

  2025-09-02 8:11 a.m.

  Authors

  koskila

  Tags

  authenticationgraph-apim365microsoft365teamsfxM365AgentsSDK

  M365 Agents SDK SSO broken - how to fix it?

  There are a lot of ways SSO can break for your bot or agent on Teams/M365 Copilot/any other M365 app. I don't even know how to explain the extensibility in M365 now, so this word salad is what you get. Anyway in this article, I'll explain how to fix one of the possible ways your setup might be broken. Background I've been working on and off with M365 Agents SDK (and Teams Toolkit before) for a while now, and have some strong opinions about it.

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• 

  Published on

  2025-08-26 1:35 a.m.

  Authors

  koskila

  Tags

  copilotdotnetghcpgithubvibecoding

  First experiences using GitHub Copilot Coding Agent

  In this article, I will share some of my first experiences using GitHub Copilot Coding Agent (or "SWE Agent" as it was known before), and some quick tips for getting the most out of it. Or maybe I'll just be sharing some fun and frustrating moments with the truly Agentic version of GitHub Copilot. Because that's almost as much fun as showing everyone the funny pictures I made with AI, right?

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• 

  Published on

  2025-08-19 5:16 p.m.

  Authors

  koskila

  Tags

  copilotOfficeLensonedrive

  Microsoft Lens is going away - what now?

  In this article, I'm complimenting Microsoft on making a fantastic app, after which I'll have the questionable pleasure of announcing that the app is going away. Because Microsoft Lens, the app that made scanning, saving and sharing documents and whiteboards a breeze, is being discontinued. Microsoft just can't tolerate an app that does one thing, and does it well. So.. What now? Background Microsoft has officially announced the discontinuation of Microsoft Lens , formerly known as Office Lens .

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• 

  Published on

  2025-08-12 6:36 a.m.

  Authors

  koskila

  Tags

  windowswindows11macOS

  All the ways a Mac baffles me as a lifelong Windows user

  Are you like me - a frustrated power user on Windows, reluctantly looking into experimenting with the ultimate smoothbrain of Operating Systems - Mac OS? Or are you already years into that process, but still finding new surprises in the machine that you haven't had to reboot since first opening it?

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