Troubleshooting Tip: Resolving 'Connection Error: System.Exception: Could not negotiate mac algorithm' on FortiSwitch

[dwivedis]

Description	This article provides guidance on troubleshooting the error 'Connection Error: System.Exception: Could not negotiate mac algorithm', which is encountered when attempting to establish an SSH session with a FortiSwitch.
Scope	FortiSwitch.
Solution	When trying to SSH into a FortiSwitch using SolarWinds, the following error message may appear: HMacList: hmac-sha2-256,hmac-sha2-512,hmac-sha1,hmac-sha1-96,hmac-sha2-256-etm,hmac-sha2-512-etm  [3374ebda] [08/13/2024 14:44:10.416] Connection Error: System.Exception: Could not negotiate mac algorithm  This issue typically arises due to a mismatch in supported SSH algorithms between the FortiSwitch and the connecting device. Workaround: Disable strong-crypto on the FortiSwitch by executing the following commands: config system global  set strong-crypto {enable | disable}  Note: Disabling strong-crypto requires a reboot of the FortiSwitch. Permanent Solution: Ensure the connecting device supports all algorithms used by the FortiSwitch. For details on the SSH algorithms supported by FortiSwitch, refer to the FortiSwitch Administration Guide at the following link: SSL | FortiSwitch 7.4.4 | Fortinet Document Library This should resolve the issue and allow successful SSH connections.