An MSP and an MSSP are hired for two different jobs. A managed service provider keeps your technology working: the laptops, the email, the backups, the network, the help desk. A managed security service provider watches that technology for signs of attack and raises the alarm, or acts, when something looks wrong. The names are one letter apart. What you get for your money is much further apart than that.
For a small or midsize business, the label matters less than three practical questions. Who notices a hijacked account at midnight on a Saturday? Who has permission to shut it down? And if you hire two providers, will they actually talk to each other when it counts? This guide answers those questions so you can decide what your business needs.
A quick note for medical readers: in healthcare, MSSP usually means the Medicare Shared Savings Program, the CMS program for accountable care organizations. This article uses the cybersecurity meaning.
What a managed service provider actually does
An MSP runs the daily operation of your IT for a monthly fee. That normally means answering help desk calls, installing updates, managing computers and phones, running backups, maintaining the firewall and network, and administering Microsoft 365. It also means dealing with vendors, planning replacements, and helping you budget. The measure of success is simple: people can work, and things do not break, and when they do, they get fixed fast.
Many MSPs run a network operations center, or a smaller version of one, with tools that flag failed backups, full disks, offline machines, and missed updates. Their contracts are measured in response times, resolution times, and uptime. A good MSP also carries a lot of security on its shoulders, because updates, multifactor authentication, and tested backups are security controls. That is why a solid managed IT services agreement should include baseline protection rather than sell it as an extra.
What a managed security service provider actually does
An MSSP asks a different question: is someone attacking you right now, and what happens next? Its core service is continuous monitoring, with analysts reviewing alerts from firewalls, servers, computers, and cloud accounts around the clock. Depending on the contract, it may also manage security tools, scan for weaknesses, keep logs for compliance, and produce the reports that auditors and insurers request.
That watching usually happens in a security operations center. Many of those centers rely on a SIEM platform, which collects events from across your systems and connects them so analysts can spot a pattern that no single device would reveal. What an MSSP usually does not do is run your IT. It will not reset the receptionist's password or fix the printer, and it needs well maintained systems to see anything useful.
Watching and stopping are not the same service
Traditional MSSP contracts are built around detection and notification. The analysts see something, confirm it is real, and tell you. Whether anyone then isolates the laptop, disables the account, or blocks the connection depends on the contract wording, and under many agreements, that step falls to your own staff or your MSP.
Services sold as managed detection and response were designed to close that gap by giving the provider both the authority and the tools to contain a threat itself. When you compare proposals, ask for the exact sentence that describes response. A promise to notify you and a commitment to contain the threat produce very different weekends.
The differences that change what you get
Side by side, the two models differ in almost every operational detail. The MSP's goal is working systems and productive people, while the MSSP's goal is finding and stopping attackers. The MSP staffs technicians, and the MSSP staffs security analysts, often on a rotation that covers every hour. The MSP's tools are for remote management, ticketing, updates, and backups, while the MSSP's tools are for collecting logs, detecting threats on computers, and tracking attacker behavior.
The contracts measure different things too. An MSP promises response times, fix times, and uptime. An MSSP promises monitoring coverage, how fast alerts are reviewed, and how they are escalated. Pricing follows the same split, with MSPs usually charging per user or per device and MSSPs charging per device, per user, or by how much log data they watch.
The difference that deserves the most attention is access. An MSP administers your systems. An MSSP often has read access to logs and little or no authority to change anything. A provider that can see a problem but cannot touch your systems has to hand the fix to someone who can, and every handoff adds minutes while an attacker is still inside.
One stolen password, three different weekends
Picture this. An employee's Microsoft 365 password is stolen on a Friday night. Someone signs in from another country and quietly creates an inbox rule that forwards every invoice to an outside address.
With an MSP alone and no after hours security monitoring, nobody may notice until Monday. By then a vendor may be calling about a changed bank account, and the attacker has spent the weekend reading threads and learning who pays whom.
With an MSP plus a separate MSSP, the MSSP's analysts catch the risky sign in within minutes and send an alert. If that alert reaches someone with the authority to act, the account is locked quickly. If it lands in a queue the MSP checks on Monday morning, the weekend looks a lot like the first case.
With one provider that owns both detection and response, the same alert goes to a team that already has permission to act. They end the session, reset the password, delete the forwarding rule, and brief you in the morning with a timeline. The tools are not necessarily better. There is simply no handoff.
Where two providers leave a gap
The MSP versus MSSP question usually comes up when an insurer, a client, or a regulator asks for monitoring around the clock. Plenty of businesses keep their MSP for daily IT and add a separate MSSP. That can work, but it creates seams. The MSSP raises an alert, the MSP has to act on it, and each side assumes the other owns the next step.
The failure points are predictable. Alerts go to a shared mailbox nobody reads on weekends. The MSSP's tools miss servers the MSP added last spring. After an incident, each report points at the other company. And both providers may license separate agents for the same laptops, so you pay twice for overlapping coverage.
If you keep two providers, close the gap with written answers rather than good intentions. Find out who receives an alert, through which channel, and within how many minutes, including nights and holidays. Find out who may isolate a device or disable an account without calling you first. Settle how new machines get added to monitoring when the MSP deploys them, who leads an incident and calls your cyber insurer's breach line, and how the two firms share tickets and logs. Vague answers mean the gap is real.
Your provider's tools are part of your attack surface
October 2026 offered a sharp reminder of why this matters. CISA added two flaws in AhsayCBS, a backup management console that security firm Huntress says is used mainly by managed service providers, to its list of actively exploited vulnerabilities on October 14. Two days later, CISA urged patching of BeyondTrust Remote Support, a tool help desks use to control employee computers, after attackers used a critical flaw to break in and move across networks.
Whoever you hire, ask what remote access and backup tools they use to reach your systems, how quickly they patch those tools, and who watches them. A provider that protects your laptops but leaves its own management console exposed has moved your risk rather than reduced it.
Why many businesses need security monitoring at all
The plain answer is that attacks do not keep office hours. Very few small businesses can watch their systems at every hour on their own, because that takes several trained people on rotation and the tools to feed them useful alerts. A security provider spreads that cost across many clients, which is how smaller firms afford it.
Regulations push in the same direction. The HIPAA Security Rule requires practices to regularly review records of information system activity, such as audit logs and access reports. The FTC Safeguards Rule requires covered financial businesses to use continuous monitoring, or annual penetration testing plus vulnerability assessments every six months. And PCI DSS version 4.0.1, available from the PCI Security Standards Council, requires security event logs to be reviewed at least once daily, which few small teams manage on their own.
That said, a five person office with a good MSP, modern endpoint protection, multifactor authentication everywhere, and tested backups may not need a separate MSSP contract. What it needs is someone accountable for acting on the alerts those tools already produce, at any hour.
How to decide what your business needs
If you have no IT staff, start with an MSP that treats security as part of the job, and ask exactly who watches alerts after hours and whether they can act on them. One accountable provider is usually the simplest and safest arrangement for a business this size.
If you have an internal IT person or team, they can keep running daily operations while an outside firm covers what one or two people cannot, which is usually after hours monitoring and incident response. That is the idea behind a shared IT support model, where the provider fills specific gaps instead of replacing your team. Write down which alerts belong to whom.
If you are regulated or hold valuable data, as medical and dental practices, law firms, accounting firms, and financial advisors do, you benefit most from continuous monitoring with documented response and reporting that maps to your obligations. You also need someone who owns security strategy, a role often filled by a virtual CISO who sets priorities and reports to the owners.
Questions to ask any provider before you sign
Plenty of providers now describe themselves as both an MSP and an MSSP, so test the claim. Ask whether real people staff the security center at every hour or overnight alerts wait for the morning shift. Ask whether the center is the provider's own or a partner's, and who is accountable if the partner misses something. Ask what they will contain on their own authority and what requires a phone call first, how quickly critical alerts are escalated and how the contract measures it, which of your systems are monitored on day one, and which reports you will receive. The answers tell you more than any service name.
How GlobeVM approaches the MSP and MSSP question
GlobeVM has supported businesses for 30 years and currently looks after more than 75 organizations across Southern California. Firewall management, endpoint protection, email filtering, and multifactor authentication are standard in every plan, and we provide 24/7 monitoring, so the basics of both jobs start on day one. When you call, a person in Los Angeles answers in under 15 minutes, often George or Nazy, the owners, in English or Farsi. For businesses across the San Fernando Valley and greater Los Angeles, that means a local voice on the line when something goes wrong.
If you are not sure whether your current setup covers monitoring and response or leaves a gap between two companies, a free IT and security assessment will show you where the line falls. You can also call us at (818) 405-9930.