Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.

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TLS 1.2 - block specific cipher suite on WAN

Tom_L3

Hello,

we use a XG430 - is there any way to block the cipher suite

TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA

on wan for a webserver keeping only TLS 1.2 with

TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

for external connections?

We need TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA for internal connections but have problems with external users who are blocked on webservers using this cipher suite because its classified as week.

I tried with the SSL/TLS inspection rules but dont find any config to block this cipher suite for external connections.

Thank you and best regards Thomas



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  • 0 in reply to LuCar Toni

    As LuCar Toni wrote, TLS settings for WAF can be configured.

    Since v20.0 there is a "Custom TLS" choice under "Web server" > "General settings" > "TLS version settings".

    Using that you can specify custom protocol and ciphersuite strings.

    BTW, on the same page you can choose "TLS v1.2 (strict)" which does not allow ECDHE-RSA-AES256-SHA.

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