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Network Security · Long Island

Network Security on Long Island: Firewalls, Segmentation and Wi-Fi

For offices, medical suites and plants across Nassau and Suffolk whose network grew one closet, one access point and one carrier at a time. NetSys designs it from a site survey, installs managed Cisco Meraki or Fortinet firewalls, separates the systems that should never talk to each other, and watches the whole network around the clock.

All IT services in Long Island, NY

The short answer

NetSys provides network security on Long Island: managed Cisco Meraki or Fortinet firewalls with intrusion prevention, segmentation that keeps medical devices, shop-floor machines, guest Wi-Fi and payment terminals apart, secure Wi-Fi, VPN and zero-trust remote access, failover to a second carrier or cellular, and 24/7 network monitoring with an engineer acting on alerts. Nassau and western Suffolk are inside our on-site area, so engineers do the site surveys, installs and cabling in person from our Brooklyn office. Pricing is quoted from the site survey, with hardware included in the agreement or bought outright, on month-to-month terms.

Service information by The NetSys Group. Our editorial standards.

How network security work is delivered on Long Island

Network projects start in the building. An engineer drives out from Park Slope, about 45 minutes to Garden City, an hour to Melville and 75 minutes to the Hauppauge industrial park with light traffic, to walk every floor, open every closet, trace the circuits back to the demarcation point and measure the Wi-Fi. Nothing is installed until the design is written down. Installs, cabling and cutovers happen on site, usually after hours. From then on, configuration changes, firmware updates and monitoring run remotely from Brooklyn, and an engineer returns when hardware fails or the office grows. Sites near Patchogue and Port Jefferson are 50 to 60 miles out, so we confirm drive time before scheduling. East End offices get firewalls shipped pre-configured, connected by their staff or their own cabling contractor while an engineer guides them by phone. Monitoring runs 24/7 from Brooklyn, and so does emergency service. Our staffed help-desk hours are 4 a.m. to 11 p.m. Eastern time, seven days a week. The proposal states severe-incident escalation, authorized remediation and any other after-hours work.

Office parks, older medical buildings and industrial closets

Long Island's building stock creates three recurring network problems. The office parks along Route 110 and the Long Island Expressway usually offer a choice of carriers and decent closets, so the work there is mostly firewall policy and Wi-Fi. Older medical buildings in Garden City and Great Neck often run several practices off one shared circuit and a landlord's switch, so a practice's traffic may cross equipment it does not control; we put the practice behind its own firewall and add a second path out. The Long Island Innovation Park at Hauppauge, a 1,400-acre park with about 1,400 organizations and more than 55,000 workers, puts many server closets a few feet from the shop floor, where CNC controllers, test benches and old Windows PCs share a flat network with the front office. Each of those needs a different design, and the site survey decides which one applies.

Circuits, carriers and failover: what to check at your address

Optimum Business, Verizon Fios and Lightpath are the options to check at most Long Island business addresses, and availability changes from one building to the next. Optimum reported nearly 900,000 fiber passings on Long Island when it announced an added $40 million investment in October 2024. Lightpath sells physically separate routes from the Island back to Manhattan carrier hotels, which matters to a firm that cannot lose its link to a data center. For a typical office, the practical design is a primary fiber or cable circuit, a second circuit from a different carrier where the building allows it, and cellular failover where it does not, with the firewall switching over automatically and alerting us. Power is the other half: Isaias took out service for about 420,000 PSEG Long Island customers in 2020, so the firewall, switches and access points sit behind a UPS sized for the outage you actually expect.

Remote access after the Suffolk breach

Suffolk County's 2022 ransomware attack began, according to the county's forensic findings, with the Log4j flaw exploited in the county clerk's office in December 2021, and the attackers moved from that network into wider county systems using passwords kept in an unprotected folder. For a business network the lessons are specific. Nothing that lets someone sign in from the internet, whether remote desktop, an old VPN appliance or a vendor's support portal, stays exposed without MFA and current patches; we replace most of them with zero-trust access that checks the user and the device before connecting them to one application. Departments and functions sit on separate segments with firewall rules between them, so one compromised system does not open the rest. Firewall and VPN logs are kept long enough to investigate months later, and Rapid7 InsightVM scans the perimeter for anything we did not know was there.

Segmentation for the industries that cluster on the Island

The right segments depend on what the business does. Medical groups need imaging modalities, lab instruments and other clinical devices isolated from staff PCs and patient Wi-Fi, because many of them cannot be patched. Manufacturers and aerospace suppliers need the shop floor separated from the office and the ERP, and those holding controlled unclassified information need it kept within a defined boundary, as NIST SP 800-171 expects. Auto dealers and tax preparers under the FTC Safeguards Rule need customer data reachable only by the systems that use it. Retailers need card terminals on their own segment for PCI DSS. Law and accounting firms mainly need guest Wi-Fi kept away from the document system and printers. In every case we document the segments, the rules between them and the reason for each, so an auditor, an insurer or your next IT person can follow the design.

What is included

Network Security on Long Island: what NetSys delivers

Firewall and edge

Managed Cisco Meraki MX or Fortinet FortiGate firewall with rules reviewed and firmware kept current
Exposed ports and vendor port-forwards closed and replaced with authenticated, logged access

Segmentation and Wi-Fi

Segments for servers, staff, finance, printers, cameras, building systems and guests on Meraki MS switching
Secure Wi-Fi with per-user authentication through Entra ID instead of a shared password

Access and monitoring

VPN or zero-trust remote access that checks the Intune-managed device before granting entry
Encrypted site-to-site links between offices, warehouses and clinics

Published case study

Multi-site medical practice: seven locations on an encrypted VPN mesh

A rapidly expanding medical practice had seven locations bolted together one network at a time, undersized servers on an end-of-life operating system and recovery objectives that existed on paper only. NetSys ran a gap analysis against the HIPAA Security Rule, refreshed the platform on Windows Server with Hyper-V, put business-grade firewalls at all seven sites joined in a site-to-site VPN mesh with per-role access controls, and added encrypted off-site backups with documented recovery objectives and scheduled restore tests. NetSys manages the servers and workstations on an ongoing basis.

Read the full case study (7 locations · 200+ staff)

From our client work

Network security work for other clients

Retail
Seven-location clothing retail chain
Management of 56 computers, point-of-sale network support, endpoint protection, and standardized Wi-Fi and firewall configurations.
Managed IT Services IT for Retail and E-commerce

Client names are withheld. These examples were chosen for the work involved, not for where the client is, so none is presented as a Long Island client.

What network security costs in Long Island

Network security is priced as a monthly managed service per site, with hardware either included on the agreement or purchased outright. What moves the number: the number of sites and circuits, whether the site needs SD-WAN across several carriers, the count of switches and access points under management, and whether 24/7 monitoring is standalone or part of a wider managed agreement. Failover circuits are billed by the carrier at cost. We quote from a site survey, and terms run month to month. Our managed IT pricing page explains how monthly fees are built.

How the monthly fee is built

Who this fits, and who it does not

Best fit: businesses on one or two floors that inherited their network, practices that need patient or client systems isolated from waiting-room Wi-Fi, companies with an office and a warehouse or second site to connect, and any business with staff at home who need a safe way back into office systems.

Network Security on Long Island: FAQs

Do you provide on-site network security on Long Island?

Yes. Engineers work on site across Nassau County and western Suffolk for site surveys, firewall and switch installs, cabling, closet cleanups, Wi-Fi design and cutovers, usually scheduled after business hours so staff are not interrupted. Monitoring and configuration changes then run remotely. For sites around Patchogue and Port Jefferson we confirm drive time before scheduling a visit. East End offices receive firewalls and access points pre-configured, installed by their own staff or cabling contractor with an engineer on the phone.

What does network security cost on Long Island?

It is quoted from a site survey rather than a price list. The number of sites and circuits, the firewalls, switches and access points under management, whether you need SD-WAN or site-to-site links between offices, segmentation work for clinical or shop-floor devices, and remote access requirements all move the figure. Hardware can sit on the agreement or be bought outright, and a backup circuit from a carrier is billed by the carrier. Agreements run month to month, and one-time projects such as recabling a closet are quoted separately.

How does internet failover work for a Long Island office?

A second circuit from a different carrier, or a cellular connection where the building has only one provider, plugs into the firewall alongside the primary line. When the primary fails, the firewall moves traffic to the backup within seconds and alerts our engineers, then moves back when the primary recovers. Cloud phones, Microsoft 365 and a cloud EHR or ERP keep working through the switch. We test the cutover with you watching before we call the job finished, and we retest after any carrier change.

Is network monitoring 24/7?

Yes. Firewall, switch, access point and circuit telemetry feed a console our engineers watch around the clock, and alerts are investigated by a person rather than forwarded by email. A failed circuit, a switch port flapping, a device that appears on the network without permission or a burst of blocked intrusion attempts becomes a ticket with an engineer assigned. Severe events, such as an office going offline or signs of an intrusion, go straight to your dedicated engineer.

Our medical suite shares a building circuit with other tenants. Is that a problem?

It can be. On a shared circuit your traffic may pass through a landlord's or another tenant's equipment, you may not control the router, and an outage someone else causes takes your office down too. We put the practice behind its own managed firewall, encrypt traffic leaving the suite, separate clinical devices and guest Wi-Fi from staff computers, and add an independent path out, either a dedicated circuit if the building allows it or cellular failover. That also makes the network section of your HIPAA risk analysis much easier to complete.

Can you secure a manufacturing floor network without stopping production?

Yes, by doing it in stages around your schedule. We start by mapping every device on the floor, often finding machines nobody listed, then design segments that separate machine controllers and test equipment from office PCs and the internet. The new firewall rules are first put in a monitoring mode that logs what would be blocked, so we can confirm every machine still reaches what it needs. The cutover happens during a planned shutdown or weekend, with your maintenance lead present and a rollback ready if anything stops.

Firewall, Wi-Fi and monitoring

Find out what your network lets through.

Discuss your firewall, segmentation, remote access and monitoring needs with an engineer. Any technical review begins with an agreed scope and access requirements.

Explore Network Security Scope 845-203-3914