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IT & Security
Intelligence.

Practical guidance on managed IT, cybersecurity, network engineering, and unified communications for businesses across industries.

246 articles published
246 articles
Cybersecurity

Rotate DKIM Keys in Microsoft 365: Two Rotations to Reach 2048 Bits

DKIM was enabled on your Microsoft 365 domain years ago and the keys have never changed, probably at 1024 bits. This walks through the selector swap, the exact PowerShell and portal steps, the 96-hour changeover, the two rotations needed to reach 2048, and the third-party signers a rotation never touches.

2026-10-30 · 9 min readRead →
Managed IT

Device Not Compliant in Intune: Mapping Each Status to Its Cause

A user is locked out of Outlook and Teams because their device must be compliant, and Intune shows Not compliant, Not evaluated or In grace period. This post maps each status to its likely cause, explains the tenant-wide settings behind the edge cases, and shows how to force a re-check.

2026-10-28 · 10 min readRead →
Cybersecurity

MFA Bypassed? Token Theft and the AiTM Response in Microsoft 365

A user approved the MFA prompt, yet the attacker is reading their mailbox from another country. This explains how adversary-in-the-middle phishing steals the session rather than breaking MFA, the Microsoft 365 response sequence in the right order, and which controls actually stop the replay, with their documented limits.

2026-10-27 · 10 min readRead →
Cybersecurity

Windows LAPS Intune Setup: One Rotating Admin Password Per PC

Every PC in the office shares one local admin password set years ago. This walks through Windows LAPS with Intune and Entra ID: the tenant switch, each policy setting and its limits, retrieval roles, manual rotation, the failure modes, and a break-glass drill for a 25-PC office.

2026-10-26 · 10 min readRead →
Networking

DHCP Option 66 vs 150: Why New Desk Phones Never Provision

New desk phones get an IP address and then sit there with no extension. This explains what option 66 and option 150 each carry, which phones read which, the boot sequence from link-up to registration, a working switch and Windows DHCP setup, and the failure at each step.

2026-10-23 · 9 min readRead →
Networking

SIP ALG One-Way Audio: Why Calls Go Silent After a Firewall Swap

A new firewall goes in and calls start connecting with no audio, dropping at about 32 seconds, or losing registration. This walks through how SIP carries media addresses in SDP, why a SIP ALG mangles them, how to confirm it with captures, and how to disable it on FortiGate and SonicWall.

2026-10-22 · 10 min readRead →
VoIP

Call Queue vs Ring Group: Which One Your Main Line Needs

A ring group decides which phones ring; a call queue also decides where callers wait, for how long, and where they go when nobody answers. This compares the two with exact settings and limits from Teams, 3CX and Asterisk, walks through a 12-person office, and lists the configurations that quietly fail.

2026-10-21 · 9 min readRead →
VoIP

10DLC Campaign Rejected: Read the Error, Fix the Right Record, Resubmit

Your 10DLC campaign came back failed with an error code and one sentence of explanation. This post explains the brand and campaign split, what the common rejection codes mean, what CTIA expects, how to resubmit without deleting, and a full rewrite of a dental office's reminder campaign.

2026-10-20 · 10 min readRead →
VoIP

Port Request Rejected? Match the LOA to the CSR, Field by Field

Your business number port came back rejected with a one-line reason code. This walks the Letter of Authorization against the losing carrier's Customer Service Record field by field, maps common reject codes to fixes, and covers simple versus non-simple timelines, the BTN trap in partial ports, PINs, DSL and FOC dates.

2026-10-19 · 10 min readRead →