GUI is not loading for checkpoint security gateway's

[Surendra]

Hi Team

GUI is not loading for checkpoint security gateway's

getting below error.

ERR_SSL_PROTOCOL_ERROR

[Duane_Toler]

Looks like you're using Gaia WebUI.  This error is from your browser which doesn't like the TLS version being negotiated.  Your browser may have a TLS configuration imposed by a GPO from your organization.  You can try with Firefox instead to see if that works.  For example, depending on your gateway configuration, the Gaia portal may not be able to support TLS 1.3:

https://support.checkpoint.com/results/sk/sk178505

If your GPO enforces TLS 1.3, then this may be your issue.

[Lesley]

Can you confirm that this firewall is still running supported software? 90% of the time this error is related to ancient firewall software