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Solved: How do I fix “failed (Host key verification failed)” error occurs when testing FortiSIEM-FortiGate connectivity with SSH credentials?

Problem Description

This article describes how to fix an issue where SSH connectivity from FortiSIEM to FortiGate does not function.


Applies to FortiSIEM version 6.6.0 and any other versions that receive the ‘Host key verification failed’ error when testing SSH connectivity to a FortiGate device.


During an attempt to configure SSH on FortiGate, a ‘failed (Host key verification failed)’ error may occur while trying to test connectivity with the SSH credentials.

If this occurs, first check whether the following entry exists within the below directory in the supervisor:


If so, delete the known_hosts file (or FortiGate entry in that file) to fix the issue. SSH credentials will then start functioning as normal when used to connect with the FortiGate.

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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