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Cisco Identity Services Engine (ISE) vs Fortinet FortiAuthenticator comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Feb 8, 2026

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

ROI

Sentiment score
7.1
Cisco Identity Services Engine enhances security, simplifies operations, and reduces costs while boosting productivity and ensuring regulatory compliance.
Sentiment score
4.9
Fortinet FortiAuthenticator may enhance security and compliance, leading to varying ROI perceptions, from cost-saving to essential expense.
Direct comparisons with Forescout reveal up to 30% to 40% difference in cost savings.
Service Line Manager (Service Operations Expert) - Network Access Control at a pharma/biotech company with 10,001+ employees
It enhances security by ensuring only the right person can access systems, even if their login credentials are compromised.
Senior Network and Security Engineer at Symbol Technologies PLC
 

Customer Service

Sentiment score
6.7
Cisco ISE support is highly rated for knowledge and responsiveness but struggles with response times and communication challenges.
Sentiment score
6.8
Fortinet FortiAuthenticator's support is generally favored for expertise but faces issues with variability in response times and depth.
I rate the technical support as one out of ten.
Service Line Manager (Service Operations Expert) - Network Access Control at a pharma/biotech company with 10,001+ employees
Cisco support has pretty good teams for support and every time we had good answers and we could somehow solve the issues we had.
Network and Technology Information Manager at Akkodis
Sometimes it's challenging to identify which support team is responsible for certain issues, which is a significant concern.
Solution Architect, Presales Engineer at a computer software company with 51-200 employees
At times, some technical staff lack knowledge, which delays issue resolution.
DevOps Engineer at YASH Technologies
Customer service and support are excellent.
Senior Network and Security Engineer at Symbol Technologies PLC
Technical support from Fortinet deserves a rating of 10.
Infrastructure Manager at Scandinavian Highlands Holding A/S
 

Scalability Issues

Sentiment score
7.3
Cisco ISE supports smooth scalability for diverse enterprises, but virtualization and hardware challenges may require strategic solutions.
Sentiment score
7.8
Fortinet FortiAuthenticator is highly scalable, supporting thousands of users, with room for improvement in deployment and user management.
Factors like architecture, business nature, and legal limitations such as GDPR affect it.
Service Line Manager (Service Operations Expert) - Network Access Control at a pharma/biotech company with 10,001+ employees
However, you can have some latency issues depending on where your devices are.
Network and Technology Information Manager at Akkodis
The scalability of FortiAuthenticator is good, and I would rate it an eight on a scale of one to ten.
IT Manager at PTECH
I find Fortinet FortiAuthenticator to be highly scalable, and I would rate it an eight out of ten for scalability.
Senior Network and Security Engineer at Symbol Technologies PLC
Fortinet FortiAuthenticator should be sufficiently scalable.
Network Engineer at Coop Money
 

Stability Issues

Sentiment score
7.7
Cisco ISE is stable and reliable, but large deployments may face challenges, requiring proper configuration and effective support.
Sentiment score
7.4
Fortinet FortiAuthenticator is reliable but may face stability issues during setup or with high user volumes.
Cisco Identity Services Engine (ISE) is considered very reliable and stable.
Solution Architect, Presales Engineer at a computer software company with 51-200 employees
The stability of Cisco Identity Services Engine (ISE) is poor for certain use cases, like authentication.
Service Line Manager (Service Operations Expert) - Network Access Control at a pharma/biotech company with 10,001+ employees
Sometimes when we have upgrades or failovers with Cisco Identity Services Engine (ISE), we had some minor issues.
Network and Technology Information Manager at Akkodis
It remains stable even when the number of concurrent users increases.
Senior Network and Security Engineer at Symbol Technologies PLC
 

Room For Improvement

Cisco ISE is hindered by complexity, compatibility issues, costly licensing, and needs improvements in usability, support, and performance.
Fortinet FortiAuthenticator struggles with integration, complex setup, limited customization, high pricing, and needs better support and documentation.
The whole setup works well with Cisco access points and Cisco switches, but when you have multiple vendors in the environment, such as HP switches or access points like Aruba, you'll find they will not work well with Cisco Identity Services Engine (ISE).
Technical Services Lead at Telenet Solutions
Pricing can be more expensive compared to other vendors, and there is a significant price gap observed, which doesn't seem justified by some specific features.
Solution Architect, Presales Engineer at a computer software company with 51-200 employees
They are very poor in asset classification and should focus on improving the preauthentication profiling, especially for NAC use cases.
Service Line Manager (Service Operations Expert) - Network Access Control at a pharma/biotech company with 10,001+ employees
For example, authentication for wireless users expires after 24 hours, requiring re-authentication daily.
Head of computer systems at Indian Institute of Space Science & Technology(IIST)
For example, Cisco Duo is on the cloud, so we cannot compete with that part if a user requires a cloud-based two-factor authentication solution.
Presales Consultant
I recommend Fortinet make its images migratable between environments.
Senior Network and Security Engineer at Symbol Technologies PLC
 

Setup Cost

Cisco ISE pricing is complex and costly, with strong vendor partnerships needed for discounts, favoring large enterprises over smaller businesses.
Fortinet FortiAuthenticator is cost-effective, offers scalable licensing, and is favored over competitors for budget-conscious enterprises.
Compared to other solutions like HPE ClearPass, Cisco is more costly, and the conversation suggests a possible forty percent price gap compared to competitors.
Solution Architect, Presales Engineer at a computer software company with 51-200 employees
The license costs can range between $50,000 to $100,000 per year for enterprises.
Technical Services Lead at Telenet Solutions
Cloud solutions are expensive, while on-prem setups with shared environments are cheaper but not effective.
Service Line Manager (Service Operations Expert) - Network Access Control at a pharma/biotech company with 10,001+ employees
Fortinet FortiAuthenticator is not overly expensive compared to other Fortinet subscriptions.
Senior Network and Security Engineer at Symbol Technologies PLC
 

Valuable Features

Cisco ISE excels in security, network access control, and integration, offering adaptability, scalability, and centralized management for organizations.
Fortinet FortiAuthenticator offers secure, efficient user access management with seamless system integration, strong two-factor authentication, and cost savings.
Cisco Identity Services Engine (ISE) offers authentication using RADIUS, enhancing network security by separating and segregating networks.
Technical Services Lead at Telenet Solutions
There is value because it helps us secure the network and prevents certain things from happening which could cause financial loss.
Ag Systems & Networks Head at UNBS
The adaptability of Cisco Identity Services Engine (ISE) policy enforcement can fit to the site we have depending on which kind of devices we have on site and then the needs for authentication, granting access and then assigning each device into its correct network for segmentation.
Network and Technology Information Manager at Akkodis
The integration with FortiToken is outstanding, adding a layer of security for authentication.
Senior Network and Security Engineer at Symbol Technologies PLC
We use multi-factor authentication for enhancing security.
DevOps Engineer at YASH Technologies
Fortinet FortiAuthenticator can be used from anywhere in the world, and the authenticator services function globally.
Assistant Manager-Networks at a university with 1,001-5,000 employees
 

Categories and Ranking

Cisco Identity Services Eng...
Average Rating
8.2
Reviews Sentiment
6.6
Number of Reviews
144
Ranking in other categories
Network Access Control (NAC) (2nd), Cisco Security Portfolio (4th)
Fortinet FortiAuthenticator
Average Rating
8.0
Reviews Sentiment
6.8
Number of Reviews
64
Ranking in other categories
Single Sign-On (SSO) (10th), Authentication Systems (5th), Identity Management (IM) (14th), Multi-Factor Authentication (MFA) (2nd)
 

Mindshare comparison

Cisco Identity Services Engine (ISE) and Fortinet FortiAuthenticator aren’t in the same category and serve different purposes. Cisco Identity Services Engine (ISE) is designed for Network Access Control (NAC) and holds a mindshare of 19.4%, down 25.8% compared to last year.
Fortinet FortiAuthenticator, on the other hand, focuses on Single Sign-On (SSO), holds 3.7% mindshare, down 7.6% since last year.
Network Access Control (NAC) Mindshare Distribution
ProductMindshare (%)
Cisco Identity Services Engine (ISE)19.4%
Aruba ClearPass18.5%
Fortinet FortiNAC14.5%
Other47.6%
Network Access Control (NAC)
Single Sign-On (SSO) Mindshare Distribution
ProductMindshare (%)
Fortinet FortiAuthenticator3.7%
Okta Platform10.4%
Microsoft Entra ID9.8%
Other76.1%
Single Sign-On (SSO)
 

Featured Reviews

NF
Network and Technology Information Manager at Akkodis
Has improved authentication management and simplified visitor network access
The log capacity in Cisco Identity Services Engine (ISE) could be enhanced because today natively on the ISE can only have a look at the logs from the day before. You cannot search into the oldest logs; you have to use another tool for that. This can be blocking if you don't have any log consolidation solution. To do a search for an issue or something that happened two days ago, you cannot search directly in there. The capacity of Cisco Identity Services Engine (ISE) could be enhanced. Something between one week and one month for the log capacity would be nice.
Sachin Vinay - PeerSpot reviewer
Assistant Manager-Networks at a university with 1,001-5,000 employees
Supports secure remote authentication and provides comprehensive user activity tracking
The most important feature is the security capability because it provides a substantial amount of security for admin-related activities. Fortinet FortiAuthenticator can be used from anywhere in the world, and the authenticator services function globally. This global accessibility is one of the critical advantages, particularly since admin features are critical and security is a real concern. With Fortinet FortiAuthenticator, secure usage of firewall services and related functions is achieved. A complete log of all users who access the authenticator setup is maintained. Monthly logs are reviewed to check for any unnoticed activities. Each authenticated user's complete activity history is recorded. This logging capability allows for providing access to more admin users while ensuring security is not compromised and all users can be monitored.
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Top Industries

By visitors reading reviews
Manufacturing Company
11%
Financial Services Firm
10%
Government
7%
Computer Software Company
7%
Manufacturing Company
10%
Computer Software Company
10%
Comms Service Provider
10%
Financial Services Firm
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business45
Midsize Enterprise32
Large Enterprise91
By reviewers
Company SizeCount
Small Business38
Midsize Enterprise18
Large Enterprise11
 

Questions from the Community

Which is better - Aruba Clearpass or Cisco ISE?
Aruba ClearPass is a Network Access Control tool that gives secure network access to multiple device types. You can adapt the policies to VPN access, wired, or wireless access. You can securely ...
What are the main differences between Cisco ISE and Forescout Platform?
OK, so Cisco ISE uses 802.1X to secure switchports against unauthorized access. The drawback of this is that ISE cannot secure the port if a device does not support 802.1x. Cameras, badge readers, ...
How does Cisco ISE compare with Fortinet FortiNAC?
Cisco ISE uses AI endpoint analytics to identify new devices based on their behavior. It will also notify you if someone plugs in with a device that is not allowed and will block it. The user exper...
What needs improvement with Fortinet FortiAuthenticator?
Fortinet can make Fortinet FortiAuthenticator better by having a cloud version of it. Currently, Fortinet FortiAuthenticator is only available for on-premises, and it is an on-premises solution. It...
What is your primary use case for Fortinet FortiAuthenticator?
Fortinet FortiAuthenticator is primarily used for authenticating admin users, including remote admin use cases. Remote admin use cases utilize Fortinet FortiAuthenticator to securely authenticate a...
 

Also Known As

Cisco ISE
FortiAuthenticator
 

Overview

 

Sample Customers

Aegean Motorway, BC Hydro, Beachbody, Bucks County Intermediate Unit , Cisco IT, Derby City Council, Global Banking Customer, Gobierno de Castilla-La Mancha, Houston Methodist, Linz AG, London Hydro, Ministry of Foreign Affairs, Molina Healthcare, MST Systems, New South Wales Rural Fire Service, Reykjavik University, Wildau University
Black Gold Regional Schools, Amadeus Hospitality, Jefferson County, Chunghwa Telecom, City of Boroondara, Dimension Data
Find out what your peers are saying about Hewlett Packard Enterprise, Cisco, Fortinet and others in Network Access Control (NAC). Updated: May 2026.
892,678 professionals have used our research since 2012.