Blog
Real case studies from our day-to-day IT support work — documented, verifiable, no invented solutions.
Error Diagnosis Without a Mouse: How to Troubleshoot Multiple Software Crashes via PowerShell
A practice client, a repeatedly crashing Sidexis 4 — diagnosed entirely via PowerShell instead of the Event Viewer.
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When Your Server Fails: Emergency Hardware Migration
A total Hyper-V host failure, a day-current backup, and two pitfalls: a ghost host and the wrong VLAN.
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When a 3D Plugin Refuses to Install: Tracing Error 1603 to Its Root Cause
A 3D plugin fails with error 1603 — system-level tracing reveals a missing, long-deprecated Windows component.
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One Click in User Management — and Four Nights of Troubleshooting
Why an administrator-reset Windows password irrevocably destroys the DPAPI key chain — and a user profile had to be rebuilt from scratch.
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Running ISDN on a Stiegeler Fiber Optic Connection
When switching to a Stiegeler fiber optic connection, your legacy ISDN system loses connectivity. A used FRITZ!Box 7590 behind the provider's router solves this — with three caveats.
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When the Trunk Isn't Broken, It's Cancelled
3CX case study: A cancelled SIP trunk and three routing rules without fallback disabled a customer's Switzerland connectivity for months.
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The Phone System Only Works Partially
A forensic case study: A 3CX system appeared broken, but the server beneath it had run DDoS malware unnoticed for seventeen days — four theories, one real culprit.
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The Browser Keeps Serving the Old Version
An updated web tool stays weeks out of date on the user's machine — why heuristic caching causes it, and how a version check reloads without touching stored data.
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"Connection lost to the server": When the front-desk PC simply goes to sleep
After replacing a front-desk PC, the practice management software repeatedly reported connection interruptions. The cause was standby and network adapter power management — three settings fix it permanently.
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KIM after PC replacement: Four causes one after another
After a PC replacement at a dental practice, KIM stopped working. Wrong host, missing DNS forwarding for .telematik, missing connector configuration and the service certificate — resolved layer by layer.
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New IT for a dental practice: What a complete overhaul really costs in time
Review of a complete practice IT migration: server and virtualisation, data backup with actual restore test, practice management software, X-ray, telematics infrastructure, VLANs and documentation — and where the time actually goes.
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Two access points, two networks: Why a PC lost connection during roaming
A CAD/CAM computer lost connection when roaming between two access points. The same SSID delivered two different VLANs via two switch ports — and the reconfiguration has its own sequence.
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3.9 MB for a thumbnail-sized image: the gap in the selection list
On phones with high pixel density, a photo gallery loaded the unscaled 50-megapixel template, individual images were missing entirely. Cause: a gap in the srcset and a 145-byte AVIF file.
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When the Connector Isn't Broken — the Key Changed in the Background
A dental practice loses its TI connection without warning. The cause wasn't a defect but a nationwide DNSSEC key rollover combined with an RSA-to-ECC certificate migration – with workaround, verification steps, and one open finding.
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BladeDraw is in the App Store: vector drawing where every stroke stays editable
Our first app of our own is here: vector brushes, layers and PDF import, and every stroke stays editable, even weeks later.
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