FastX RSA Private Keys not working in browser


The RSA private key is not being recognized by FastX when importing the key into the browser client. FastX will error with an invalid key.

RSA keys with the format starting with “BEGIN OPENSSL PRIVATE KEY” is not supported by the FastX browser client.


  • Downgrade your ssh-keygen binary
  • Add option -m PEM into your ssh-keygen command. For example, you can run ssh-keygen -m PEM -t rsa -b 4096 -C "" to force ssh-keygen to export as PEM format.