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After disabling TLS 1.1, Qualsys still reports it is enabled


FUNDY MUTUAL

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If you look at the 3rd screenshot it tells you which ciphers are being considered as TLS1.1. If you look at https://docs.microsoft.com/en-us/windows/win32/secauthn/tls-cipher-suites-in-windows-10-v1511 and search for TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (one of the ones listed in the 3rd screenshot) it shows that it supports 1.0 - 1.2. I have a feeling that TLS1.2-ECDHE-RSA-AES-256-SHA384, TLS1.2-ECDHE-RSA-AES-128-SHA256, TLS1.2-DHE-RSA-AES-GCM-SHA384, and TLS1.2-DHE-RSA-AES128-GCM-SHA256 are the ones that support lower versions of TLS than 1.2. Try removing them and then running the scan again.

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Ah ha!  This Netscaler is behind a WatchGuard XTM with a HTTPS packet filter (not to be confused with a HTTPS proxy which the XTM also supports).  We have Geoblocking and IPS enabled on the NAT policy.  Once I disabled both Geoblocking and IPS on the incoming HTTPS policy, TLS 1.1 disappeared from the test results.

 

dcc

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