DATAPUISTOKEMISTI

Laptop powers on but nothing on screen. This is often because eeprom (Winbond W25Q32FVSIQ, 32Mbit / 4MB, 2.7V - 3.6V, SPI/QPI) loses programming over time and one day laptop will simply no longer boot. At first it will blink some leds on keyboard and turns off. Then it will degrade to just beeping on boot.

Toggling "Visible to users" setting on portal adds / removes tag called HideApp.

Microsoft provides weekly updated list of IP addresses used by various Azure features as downloadable JSON file on their webpage. Automating download of it is however not supported and prone to breakage. Same information is now also available via Azure Service Tag Discovery API. New API is still in public preview state and list of IPs it provides is far less than downloadble file contains. So either list of IPs from API is tailored for your particular subscription or it is incomplete. Discovery API requires authenticated session to Azure so we need to create service principal and custom RBAC role to keep things secure. See you for more after the break.

There's really bizarre bug in RHEL7 / CentOS7. Once per hour NetworkManager will remove IP addresses from ethernet interface after hitting some bug and triggering "link loss" action. Interface may come back by itself or may not. It does come back when you login as root on console as login triggers some repair action part via systemd...

Another pointless change just to break backwards compatibility - RHEL7 and CentOS7 prevent users with uid lower than 1000 from logging in. This is bad when you're migrating accounts from existing Linux server where uids start at 500.

Short version: Not as simple as you thought.

So you have setup with Aruba RAPs that bridge their wired ports to VLAN on controller. Web interface only tracks wireless clients so you have no idea what AP client with particular IP is connected to.