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CCA not working behind another XGS and RED

Hello,

We use the Client Authentication Agent (CCA) for authentication when accessing our network.


We use the client at various external locations which are all connected via RED. At one location (behind a Sophos UTM) this works without any problems. At two locations, both behind a SophosXGS, the agent does not work. As soon as we have entered the authentication data, the mask closes but nothing happens. Neither an error appears nor is the connection established.


We have already deactivated authentication clients in all zones of the local firewalls.


We suspect that the local XGS is still intercepting packets here.


If we open the Auth Portal via https://portal:8090, we can authenticate ourselves without any problems.


Does anyone have any idea where the problem could lie?



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