28to3.me - Resources

1. Essential Web Portals (The Link Hub)

- Microsoft Admin Portals: https://msportals.io/ - The holy grail for landing directly into specific Entra, Exchange, or Endpoint Manager nodes without clicking through the main M365 admin center.

- Security & Breach Checks: https://haveibeenpwned.com/ - For checking if a user's compromised password stems from a known third-party data breach.

- Mail Flow & DNS Diagnostics: https://mxtoolbox.com/ - Quick blacklists, MX record checks, and SPF/DKIM/DMARC validation.

- Tenant Lookup: https://aad.portal.azure.com/ or https://odc.officeapps.live.com/odc/emailmasters/getmaster?msa=0&email=user@domain.com - Excellent for verifying if a domain is federated (e.g., GoDaddy managed M365) versus standard tenant routing.

2. Quick Command Cheat Sheet

- Network Diagnostics (Command Prompt / PowerShell):

ipconfig /flushdns && ipconfig /registerdns

ipconfig /release && ipconfig /renew

powershell -Command "(Invoke-WebRequest-Uri 'https://api.ipify.org').Content"

- Windows System Repair & Maintenance:

DISM.exe /Online /Cleanup-image /Restorehealth && sfc /scannow

gpupdate /force

net stop wuauserv && net stop bits && del /f /q /s %windir%\SoftwareDistribution\* && net start wuauserv && net start bits

- Windows Component Quick-Launch Codes (Win + R shortcodes):

- sysdm.cpl - System Properties (Computer Name, Domain membership, Advanced environment variables).

- ncpa.cpl - Network Connections (Adapter settings, static IP configuration, IPv4 properties).

- appwiz.cpl - Programs and Features (Uninstalling software, checking install dates).

- services.msc - Windows Services (Restarting Print Spooler, SysMain/SuperFetch, etc.).

3. Active Directory & Microsoft 365 PowerShell Snippets

- Connect to Exchange Online and Entra ID simultaneously:

Connect-ExchangeOnline; Connect-MgGraph

- Check why a user account is locked out in Active Directory (On-Premises):

Search-ADAccount -LockedOut | Select-Object Name, SamAccountName

- Force a manual delta sync on the Microsoft Entra Connect server:

Start-ADSyncSyncCycle -PolicyType Delta