NetLinx NX Controllers: Adding ED25519 SSH Key Support for SFTP and Extron NAVigator Compatibility
Escalation Article
Written by Daniel Fabriczy
Updated at June 23rd, 2026
Table of Contents
Brand:
- AMX
Affected Products:
- FG2106-02 NX-2200 (NX-Series Controllers)
Summary:
- In older NetLinx firmware versions (such as v1.8.159), connecting to or controlling external devices like the Extron NAVigator via SFTP failed due to a lack of support for modern SSH key algorithms like
ssh-ed25519. An update was required to introduce ED25519 SSH key compatibility into the NetLinx firmware framework.
Troubleshooting:
If you are running an older firmware release and experiencing SFTP connection failures or key authentication issues with third-party systems:
- Check your current NetLinx firmware version.
- Upgrade the controller firmware to v1.8.170 or later. This release introduces formal support for
ssh-ed25519key types.