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A10 Networks Thunder SSL Insight (SSLi) vs Fortinet FortiDDoS comparison

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Comparison Buyer's Guide

Executive Summary

Review summaries and opinions

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

Categories and Ranking

A10 Networks Thunder SSL In...
Average Rating
9.0
Number of Reviews
3
Ranking in other categories
SSL/TLS Decryption (2nd)
Fortinet FortiDDoS
Average Rating
8.2
Reviews Sentiment
6.9
Number of Reviews
15
Ranking in other categories
Distributed Denial-of-Service (DDoS) Protection (14th)
 

Mindshare comparison

A10 Networks Thunder SSL Insight (SSLi) and Fortinet FortiDDoS aren’t in the same category and serve different purposes. A10 Networks Thunder SSL Insight (SSLi) is designed for SSL/TLS Decryption and holds a mindshare of 23.2%, down 31.7% compared to last year.
Fortinet FortiDDoS, on the other hand, focuses on Distributed Denial-of-Service (DDoS) Protection, holds 2.1% mindshare, down 2.5% since last year.
SSL/TLS Decryption Mindshare Distribution
ProductMindshare (%)
A10 Networks Thunder SSL Insight (SSLi)23.2%
Symantec SSL Visibility Appliance23.7%
Fidelis Elevate19.5%
Other33.599999999999994%
SSL/TLS Decryption
Distributed Denial-of-Service (DDoS) Protection Mindshare Distribution
ProductMindshare (%)
Fortinet FortiDDoS2.1%
Cloudflare11.2%
Imperva Application Security Platform7.4%
Other79.3%
Distributed Denial-of-Service (DDoS) Protection
 

Featured Reviews

KM
Data Center Network Engineer at BRIDGETON PUBLIC SCHOOLS
Enables our content filter to do its job without any noticeable delay
Its most valuable feature is its ability to do its job accurately, effectively, and very quickly. The amount of traffic that we have going through our system is astounding. We have 6,900 students and about 1,100 staff members. Most of our teachers and staff are connecting through our system. You add to that all the cell phones, the iPads, and all the computers, and then each individual website's connection, that's a lot of traffic in a period of one second. The delay with the SSL decryption turned on is almost unnoticeable. That is great because most SSL decryption solutions — a couple of competitors we did try — their devices crashed as soon as we turned decryption on.
MO
IT Analyst at Evapco, Inc.
Reliable protection and smooth setup enhance company security
Currently, I have two firewalls, with one located in Sorocaba, model 90D, and the other in São Paulo, model 30D. They are connected by VPN. I use the firewalls for VPN and final protection for my company, and my equipment is maintained by an internet company called Multiprox The equipment works…

Quotes from Members

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

Pros

"Its most valuable feature is its ability to do its job accurately, effectively, and very quickly. The amount of traffic that we have going through our system is astounding... The delay with the SSL decryption turned on is almost unnoticeable."
"With the Thunder SSLi, we're better protected; we can stop use of VPN and proxies, are better protected against dirty traffic coming back to our schools, and having a secure decrypt zone with the equipment lowers the chances that our security infrastructure could possibly miss an attack."
"This is one of those devices that, once you turn it on and it's functioning properly, you'll forget that you have it."
"We have several proxies in our environment, so we localized internet traffic between these proxies. Instead of getting a really huge proxy box, according to our size, we can use three boxes and share the traffic with A10's load-balancer feature."
"By not renewing six proxy boxes, rather just three of them, it saved over $100,000."
"We have researched them all, and it's a good solution all around."
"We use it to protect our users and their data."
"The solution already has security profiles and it can protect from DDoS attacks and other kinds of attacks."
"I find the interface easy to use."
"It is a user-friendly product in terms of monitoring and updating policies."
"The most valuable feature is the cloud DDoS scrubbing capability."
"The equipment works very well, and I have not encountered any issues with it. It is a good solution for my company."
"Packet inspection has been effective for mitigating DDoS attacks."
 

Cons

"There is one thing I would like to see changed. In their features for setting things up, there is a templating system that would normally assist clients. However, we had a better time setting up the device either through the command line or through the interface and not using the templates that were pre-installed. So there is room for improvement to the templates for initial installation."
"I would like them to have a better UI (better universal design)."
"It would be great if it supported SSL operations according to Active Directory users. For example, if we want to bypass one of the servers or a client's internet access for SSL interception, we have to do it according to the IP address. It would be better if we could do it according to the Active Directory username. A10 says they kind of support that but we haven't tested it."
"SSLi is a very powerful device. It has many features and to get them configured is kind of tough."
"The primary area for improvement is the on-premises capacity limit, currently fixed at 10 GB."
"Alerts and reporting features must be improved."
"The web interface could be much better."
"The solution can be a little more user-friendly and it can be more affordable."
"The initial setup is complex. It is always complex."
"I find that there have been issues in the past year with the solution hanging. It freezes often."
"The challenge lies within the customer environment, particularly in Brazil, where companies have stringent security requirements for implementing solutions."
"There aren't really any aspects of the solution we are unhappy with. It's been a positive experience overall."
 

Pricing and Cost Advice

"Our licensing costs, yearly, are just under $15,000. Your initial cost of acquisition is obviously going to be more than $15,000..."
"We always pay for support. Any organization of our size who doesn't is asking for problems."
"When you purchase the equipment, you purchase the licensing and warranty. It's all fairly standard. We haven't been caught with anything surprising."
"The solution is reasonably priced."
"It's quite pricey."
"The product’s pricing needs improvement."
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Top Industries

By visitors reading reviews
Outsourcing Company
14%
Manufacturing Company
9%
Comms Service Provider
9%
University
7%
Comms Service Provider
13%
Financial Services Firm
11%
Government
7%
Manufacturing Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business10
Large Enterprise6
 

Questions from the Community

Ask a question
Earn 20 points
Which is the best DDoS protection solution for a big ISP for monitoring and mitigating?
Arbor would be the best bid, apart from Arbor, Palo Alto and Fortinet have good solutions. As this is an ISP, I would prefer Arbor.
What is your experience regarding pricing and costs for Fortinet FortiDDoS?
Fortinet FortiDDoS offers lower costs compared to other solutions. The licensing costs are annually renewed.
What needs improvement with Fortinet FortiDDoS?
There is a need for more features that protect personal information, especially given the PDP issue in Indonesia.
 

Also Known As

Thunder SSLi
Fortinet DDoS, FortiDDos
 

Overview

 

Sample Customers

Klein Independent School District
Black Gold Regional Schools, Amadeus Hospitality, Jefferson County, Chunghwa Telecom, City of Boroondara, Dimension Data
Find out what your peers are saying about Broadcom, A10 Networks, Gigamon and others in SSL/TLS Decryption. Updated: October 2026.
920,769 professionals have used our research since 2012.