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Cisco Identity Services Engine (ISE) vs Fortinet FortiAuthenticator comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Nov 2, 2025

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
5.1
Fortinet FortiAuthenticator improved security and compliance, yet financial gains are hard to quantify with some citing reduced costs.
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
We also save money because we increased security, stopped incidents, and reduced breaches and security breaches.
Cybersecurity Team Leader at EMAK For Integrated Solutions
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 offers generally responsive support with some variance in effectiveness based on complexity and local availability.
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
TAC support from Cisco is a notable feature; it provides very professional support.
Cybersecurity Team Leader at EMAK For Integrated Solutions
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 offers scalable user capacity and integrates well, though minor manual adjustments may be needed.
You can run an all-in-one deployment and switch to distributed mode as your company grows, relying on Cisco Identity Services Engine (ISE) to support your scalability needs.
Cybersecurity Team Leader at EMAK For Integrated Solutions
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 generally stable, though hardware defects and syncing issues affect performance in high-volume environments.
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 needs improved usability, integration, support, affordability, customization, and stability for better user authentication efficiency.
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)
I recommend Fortinet make its images migratable between environments.
Senior Network and Security Engineer at Symbol Technologies PLC
The technical support could be improved as some staff lacks the necessary knowledge to assist effectively.
DevOps Engineer at YASH Technologies
 

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 praised for its affordable, straightforward user-based pricing, especially compared to Cisco solutions.
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 easy setup, cost-effectiveness, strong integration, detailed logging, and flexible two-factor authentication options.
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
145
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
63
Ranking in other categories
Single Sign-On (SSO) (7th), Authentication Systems (3rd), Identity Management (IM) (10th), 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 22.4%, down 28.3% compared to last year.
Fortinet FortiAuthenticator, on the other hand, focuses on Single Sign-On (SSO), holds 3.7% mindshare, down 8.0% since last year.
Network Access Control (NAC) Market Share Distribution
ProductMarket Share (%)
Cisco Identity Services Engine (ISE)22.4%
Aruba ClearPass21.6%
Fortinet FortiNAC16.1%
Other39.9%
Network Access Control (NAC)
Single Sign-On (SSO) Market Share Distribution
ProductMarket Share (%)
Fortinet FortiAuthenticator3.7%
Microsoft Entra ID12.6%
Okta Platform8.5%
Other75.2%
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.
Yonas Abebe - PeerSpot reviewer
Senior Network and Security Engineer at Symbol Technologies PLC
Integration capabilities simplify authentication and migration challenges need addressing
The integration capabilities of Fortinet FortiAuthenticator are very interesting, as it can be integrated with third-party devices easily and is straightforward to configure. The integration with FortiToken is outstanding, adding a layer of security for authentication. In addition, it can be used by integrating with zero trust single access, enhancing overall security measures.
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Top Industries

By visitors reading reviews
Computer Software Company
12%
Manufacturing Company
11%
Government
9%
Financial Services Firm
9%
Computer Software Company
14%
Comms Service Provider
10%
Government
7%
Manufacturing Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business44
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 FortiAuthenticator could benefit from some artificial intelligence functionality and resolution of some glitches that may exist.
 

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: December 2025.
879,853 professionals have used our research since 2012.