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ALIF: RedHat8 - Firefox78 - "SSL_ERROR_UNSUPPORTED_VERSION" Message on Webinterface

The combination of RedHat8 and Firefox78 forces an SSL Error on the ALIF Web interface.

Other Webbrowser under RedHat acting the same way.

This is due to the fact, that we are not supporting/using TLS1.2 and newer, only older Versions.

To get around this here are the Steps (please inform your IT Department, as it could be against their security rules):

On RHEL8, by default, TLS 1.0 and 1.1 are disabled by policies.

To enable this, follow these step:

  • update-crypto-policies --set LEGACY
  • Reboot
  • The default configuration is DEFAULT (# update-crypto-policies --show)


On Firefox78, by default, TLS 1.0 and 1.1 are disabled

To enable this, follow these steps:

  • On the address field, access to “about:config”.
  • For the parameter “security.tls.version.enable-deprecated”, change the value “false” to “true”.


Now you should be able to access the Web interface without any Error Messages.


Page last modified on Monday January 10, 2022 13:59:39 GMT-0000