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Network Security · Manhattan

Network Security in Manhattan, NY: Firewalls, Wi-Fi and Failover

A Manhattan suite usually has one closet, one carrier in the riser, a crowded Wi-Fi band and a landlord who decides when cable can be pulled. NetSys designs, installs and manages network security for those offices: firewalls, segmentation, wireless, remote access and a second path out, with engineers from Brooklyn doing the physical work.

All IT services in Manhattan, NY

The short answer

NetSys provides network security in Manhattan: managed Cisco Meraki or Fortinet firewalls, network segmentation, secure Wi-Fi with a separate guest network, remote access that checks the user and the device, ISP failover and continuous monitoring of every firewall, switch and access point. Manhattan is inside our on-site area, so engineers from our Brooklyn office survey the suite, install the equipment and meet carrier technicians in person, while configuration and monitoring run remotely. Monitoring and emergency service run 24/7; the help desk is staffed seven days a week from 4 a.m. to 11 p.m. Eastern time.

Service information by The NetSys Group. Our editorial standards.

How network security is delivered in Manhattan

Network work in Manhattan is physical first. An engineer from our Park Slope office, a subway ride of about 25 minutes to the Financial District or 35 to 45 minutes to Midtown, surveys the suite: the closet, the demarc location, the riser path, power and cooling, and where the access points need to hang. Installs happen in the building's approved work window, often in the evening or on a weekend, with the freight elevator booked and the managing agent's insurance certificate filed before anyone arrives. After cutover, the firewall, switches and access points are managed from the Meraki or FortiGate console, firmware and rule changes are made remotely during agreed windows, and an engineer returns when hardware fails or a carrier technician needs someone to meet them in the basement. 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.

Risers, demarcs and the one-carrier building

Pre-war Manhattan office buildings have a single carrier in the riser more often than not, and the landlord or a riser management company decides who can add another. A single fiber path is one construction accident, one flooded vault or one failed card at the carrier away from a dark suite. Sandy showed the scale: seawater poured into the basement cable vault of Verizon's hub at 140 West Street, and Verizon replaced damaged copper with fiber as it rebuilt. Carrier options to check at your address include Verizon Fios, Spectrum Business, Lightpath and Zayo, which took over Crown Castle's fiber business in May 2026. Where a second wired carrier is not possible, a 5G or LTE gateway on the firewall gives a physically different path, and we test the switchover with you watching.

Remote access after the MTA's VPN breach

In April 2021, hackers linked to China used flaws in Pulse Connect Secure, the VPN appliance the MTA relied on for remote access, to get into three of the agency's 18 computer systems; the MTA said train operations were not affected. That month CISA issued Emergency Directive 21-03 ordering federal agencies to check and patch Pulse appliances, and in January 2024 it issued Emergency Directive 24-01 for Ivanti Connect Secure, as the product is now called. Internet-facing VPN boxes are a favored entry point because they sit outside every other control. Our design keeps remote access on the managed Meraki or Fortinet firewall with multifactor sign-in, or replaces it with Conditional Access to cloud applications so there is no inbound VPN to attack. Firmware on anything facing the internet is patched first, and the firewall's admin interface is never reachable from outside.

Segmentation and Wi-Fi in a crowded tower

On a Midtown floor your access points share the air with dozens of networks from neighboring tenants, so Wi-Fi design is as much about channel planning as coverage. We survey the space, place access points for the walls and glass you actually have, use the 5 GHz and 6 GHz bands where devices support them, and set transmit power so the signal stays inside your suite as far as possible. Then the network is divided by purpose: staff devices, a guest network that reaches only the internet, conference room and AV gear, printers and copiers, and any building-supplied systems such as access control readers. Traffic between those segments passes through firewall rules, so a compromised smart TV or a visitor's laptop cannot see the file server. Every rule change is logged and reviewed each quarter.

Monitoring, rule reviews and evidence for audits

A firewall nobody watches is frozen at the day it was installed. We monitor every firewall, switch and access point around the clock, alert on a failed circuit or a port going down, and keep each configuration backed up and documented in IT Glue. Intrusion prevention and content filtering run on the firewall, and its alerts sit alongside the ThreatDown and Microsoft 365 signals our engineers already watch. Temporary vendor access is switched off when the work ends, and Rapid7 InsightVM scans the internal network for devices and services that should not be there. For a DFS-licensed firm, or a fund working through an investor's due diligence questionnaire, those records answer the network questions with dates and screenshots rather than assurances.

What is included

Network Security in Manhattan: 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

Large multi-divisional company: one platform, two isolated worlds

Two divisions of a 300-person health-services company had grown separate IT stacks with duplicate servers, licensing and backups. NetSys designed a single central platform with shared infrastructure at the base and strict logical separation above it: centralized servers, VPN, file storage and virtual desktops, with identity segmented by division through separate access policies, MFA everywhere and Conditional Access by role. Divisions were migrated one at a time with parallel-run weekends, and one security stack, immutable backups and 24/7 monitoring now cover both. The company reported 44% lower annual infrastructure spend after eliminating the duplicate stack.

Read the full case study (300+ employees)

From our client work

Network security work for other clients

Dental practices
Multi-location dental practice
Management of 48 computers across 6 offices, endpoint protection, network segmentation, and centralized backup monitoring.
Managed IT Services IT for Dental Practices

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

What network security costs in Manhattan

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 in Manhattan: FAQs

Do you provide on-site network security in Manhattan?

Yes. Engineers come from our Park Slope office to survey, cable and install firewalls, switches and access points, and they return for hardware failures and carrier appointments. We file the building's insurance certificate, book freight and work windows with the managing agent, and plan installs for evenings or weekends when the landlord requires it. Configuration changes, monitoring and firmware updates are handled remotely, which keeps visits for the work that genuinely needs someone on the floor.

What does network security cost for a Manhattan office?

We quote it after a site survey rather than from a price list. The figure depends on the number of offices and circuits, how many switches and access points are under management, whether you buy hardware outright or have it on the agreement, the remote access design and any compliance reporting you need. A second circuit or cellular gateway is quoted with the carrier's own charges shown separately, and ongoing management runs month to month.

How does ISP failover work in a Manhattan building?

The firewall holds two connections: the primary circuit and either a second carrier or a 5G or LTE gateway, ideally entering the building by a different path. When the primary drops, the firewall moves traffic to the backup and moves it back when the primary recovers, while monitoring alerts an engineer. Calls and video keep working if the backup has enough capacity, which we size from your actual usage. We test the cutover with you present, because a failover that has never been pulled is only a theory.

Do you install and manage Meraki and Fortinet firewalls?

Yes. We specify, install, configure and manage Cisco Meraki MX and Fortinet FortiGate firewalls, keep firmware current, run intrusion prevention and content filtering, back up the configuration and review the rule base every quarter. Vendor and contractor access through the firewall is time-limited and logged. If you already own a supported firewall in good condition, we can take over its management after reviewing its configuration instead of replacing it on day one.

Can you secure our network if the building or a co-working operator runs it?

Partly, and we say which part. On a network you do not control, we cannot segment or inspect traffic at a firewall, so protection moves to the devices: Intune policies, ThreatDown, DNS filtering and Conditional Access that requires a managed device. Inside your own space we can still add a small firewall in front of a printer, a conference room or a closet server. When you take a suite of your own, we design the full network and move devices onto it without rebuilding them.

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