MSSP vs MDR: managed security services in plain English

Managed security sounds like one thing, but vendors sell two very different products under the label: MSSP and MDR. Buying the wrong one is how businesses end up paying for monitoring while nobody actually responds to anything.

An MSSP (managed security service provider) is your outsourced security operator. They manage the tools — firewall, endpoint protection, email filtering — and alert you when something looks wrong. Think of them as the people watching the cameras: when an alarm trips at 2 a.m., you get a notification. What happens next is usually on you.

MDR (managed detection and response) goes a step further: when the alarm trips, their team investigates and acts — isolating an infected laptop, killing a malicious process, locking a compromised account — often before you're awake. Detection plus response, not detection plus an email to you.

The pricing difference reflects that. Basic MSSP-style monitoring can start in the low hundreds per month for a small business; MDR typically costs meaningfully more, often priced per device or per user. Ask exactly what 'response' includes — some vendors market MDR but only ever recommend actions, which is monitoring with better branding.

Questions that cut through the sales deck: Who responds at 2 a.m., a person or a playbook? What's your average response time, and can I see it in the contract? Does the service include the security tools themselves, or do I bring my own? What happens to my data and access if I cancel?

One trap worth knowing: some contracts auto-renew for a year or more and require 60–90 days' notice to cancel. Security is a long-term relationship, but get the renewal terms in writing before you're locked into a service that hasn't proven itself.

Most small businesses don't need a security operations center — they need the right-sized combination of tools, monitoring, and someone who answers the phone when it matters. A TSI advisor can assess what you actually need and get competing quotes from vetted providers, free.