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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Client Access - Bookmarks RDP: Protocol Security Negotiation Failure error

Vinod V

I am trying to configure SSL VPN clientless access with Bookmark RDP access to user systems. While trying to connect after initial VPN logon, ie. while clicking RDP bookmark, i am getting the error "Protocol Security Negotiation Failure". Tried all protocol security combinations TLS,RDP and NLA.  Also tried disabling NLA in Client Computers. Most of the client systems are Windows 10 Pro and also tried to connect to Windows 2008 R2, windows 2019 but getting same error. We are using Sophos XG 230 (17.5.8 MR8)

Due to security reasons SSL2,SSL3 and TLS 1.0 are disabled in our network and only TLS 1.1 and TLS 1.2 is enabled.

Please support.

 

Update:

It is working fine when enabled SSL2,SSL3 and TLS 1.0 in a few test systems. So, the issue seems to be Sophos RDP not supporting TLS 1.1 and TLS 1.2. Do I need to manually configure anything to get TLS 1.1 and TLS 1.2 supported in Sophos?



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