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All Posts (539)

• 

  Published on

  2026-04-07 2:10 a.m.

  Authors

  koskila

  Tags

  blazor

  Blazor Server in Azure App Service 404 errors

  This article explains another dumb issue I ran into. Suddenly - without a warning - a Blazor app running on an Azure App Service starts becoming unresponsive. And this happens without any changes by you. How do we start investigating this? Where do we go from here? Why are we still here, just to suffer? The answer is YES, we are still here, just to suffer. And as part of YOUR suffering, you get to read this article, which is a step-by-step guide to fixing this issue. So, let's get started.

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• 

  Published on

  2026-03-31 2:22 a.m.

  Authors

  Koskila

  Tags

  copilotcopilotstudiomicrosoft365microsoft-teams

  How to install Copilot Studio Agents in Teams (even when it fails)?

  In this week's article I'm sharing some of my experience with installing Copilot Studio Agents in Microsoft Teams. Namely, how to install them even when Teams says "no". Background So you have built a beautiful Copilot Studio Agent, and now you want to use it in Microsoft Teams. How do you get it there? Well, you of course navigate to "Channels" and select "Teams and Microsoft 365 Copilot" as the channel type.

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• 

  Published on

  2026-03-24 4:06 a.m.

  Authors

  Koskila

  Tags

  outlook

  No, New Outlook (NEW) still can't subscribe to an online calendar

  This article explores the problematic task of adding an online calendar to New Outlook (NEW), and how to work around the issue by using Outlook on the web (OWA) instead. Background Now, unlike in Windows (at least in theory), on a Mac you can't change the default calendar app to something else than Apple Calendar. So if you click on a calendar link in an email, it will open in Apple Calendar - and if you want to subscribe to an online calendar, you better subscribe to it in Apple Calendar.

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• 

  Published on

  2026-03-17 3:24 a.m.

  Authors

  Koskila

  Tags

  mvpawardmvpbuzzmvpsummit

  USA - giving strong 'Not This Year' vibes 🥲

  What exactly is happening in the USA? The once-great country seems hell-bent on shooting themselves in the foot again, again and again, and knowing what a bad shot most people are, I've chosen to stay out of the line of fire this time around and canceled my travel plans. It bleeds my heart not to make it to the MVP Summit in person to meet up with all the amazing people, and of course to take the excuse to go on a little road trip to check some of the missing states off the map.

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• 

  Published on

  2026-03-10 9:43 a.m.

  Authors

  Koskila

  Tags

  copilotmicrosoft

  Microsoft's AI Revolution: $99/mo E7 Brings Copilot Cowork and Agent 365

  Yesterday, Microsoft announced the next big steps in their, I mean, everyone's AI journeys in the M365 space! Namely, we now know that Agent 365 is going to cost $15/user/month. It's still very unclear what do you get with the price exactly - but at least there's now a number!

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• 

  Published on

  2026-03-03 3:49 a.m.

  Authors

  Koskila

  Tags

  omniasharepointvalo-intranetSPat25

  Happy 25th birthday, SharePoint! 🎉

  This article is my love letter to the 25-year-old workhorse in the Microsoft ecosystem - SharePoint. Let me take you on a wild ride through my personal journey and love-hate relationship with SharePoint! Intro So on March 2nd, 2026, SharePoint turned 25 years old. It can now not only drive, but also vote and drink - hopefully not at the same time, even if drinking and voting DOES sound like a great time! My first day job in 2011 was a SharePoint developer.

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• 

  Published on

  2026-02-24 9:02 a.m.

  Authors

  Koskila

  Tags

  sharepointgraph-api

  How to use Graph Subscriptions to monitor changes on a SharePoint site?

  In this article, I'll show you how to get notified by Graph API about the latest changes like file updates in your SharePoint document library.

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• 

  Published on

  2026-02-17 4:21 a.m.

  Authors

  Koskila

  Tags

  gitgithubwindows

  Git failing with a Filename too long fatal: Could not reset index file to revision 'HEAD

  In this article I'll explain a simple way to fix the "Filename too long" error when using Git on Windows, which can be especially frustrating when it works fine on other platforms like macOS.

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• 

  Published on

  2026-02-10 4:38 a.m.

  Authors

  Koskila

  Tags

  Frontierm365M365Copilot

  Help! My Frontier Office Agents disappeared! What do?

  Did your Frontier Office Agents vanish without a trace? Don't panic—you're not alone. Many Microsoft 365 users have experienced the frustration of losing access to their custom Frontier Agents. The good news? They're not gone for good. In this guide, we'll show you exactly where your missing Office Frontier Agents went and how to find them again using the Microsoft 365 Admin Center. Background So you had access to the Frontier Office Agents in your Microsoft 365 tenant.

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• 

  Published on

  2026-02-03 2:43 a.m.

  Authors

  Koskila

  Tags

  m365m365agentssdksessions

  Thank you Cloud Tech Tallinn 2026!

  Ever had one of those conferences that are fun, informative, and did I say - fun? No matter whether you're a speaker or an attendee, Cloud Tech Tallinn 2026 was one of those! For me personally, what started as "hey, we should geek out on this new AI stuff" with Michael Maillot over half a year ago, turned into 45 minutes of pure Microsoft 365 Agents SDK goodness - and chaos! - complete with a demo that actually worked (yes, really!

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• 

  Published on

  2026-01-27 4:47 a.m.

  Authors

  Koskila

  Tags

  m365sessionsM365AgentsSDK

  At Cloud Tech Townhall Tallinn 26? Come say hi!

  If you are attending CTTT26 in the beautiful city of Tallinn on January 29-30, come say hi! I will be there both days, and would love to chat about all the exciting things happening in the world of Microsoft 365 and AI agents. In 2025, I had the pleasure to present at CTTT25 , and it was a fantastic experience. That's why I was super thrilled to be accepted as a speaker again this year!

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• 

  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

  copilotgithubmarkdown

  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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