I do not know how the client works so I cannot see the traffic for myself. However you should still be able to see the URL's eventhough the traffic is SSL. Perhaps a submission for application detection is in order?
Submit an application:
Hope this helps...
Just in case you do use URL filtering:
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In my experience SSL decryption and blocking the application Psiphon was not enough, it was only the first step. Psihon was stll able to connect. I discovered that Psiphon creates a Proxy service on localhost and changes proxy settings in browser to redirect browser traffic over Psiphon application. Psiphon application then forwards the traffic to the internet by its own sneaky methods:) I did Wireshark analysis and discovered that after SSL connection was blocked by PAN, Psiphon created a gzip encoded streaming tunel over tcp port 80 and PAN recognised it as "web-browsing" which was allowed. I tried to create a custom application but without success.
We successfully blocked the Psiphon by implementing SSL Decryption, blocking Psiphon application in the security policy and also by preventing users from changing their proxy settings using domain group policy.
Creating custom application signature for port 80 traffic and blocking it in the security policy on PAN would be more elegant but my signature caused too many false positives and it was easier to create a group policy.
from my testing, blocking just Psiphon while using decryption was not enough. If you leave the client to try and connect long enough, it will still connect.
The best results I've got was by blocking the following:
ipsec (not ipsec-udp)
There's actually an article about how to block psiphon :
If you feel it is incorrect please leave a comment there for review.
Hope this helps.
I could block the Psiphon, with a security policy denying in application "psiphon/unknown-tcp/ssh" and SSL decrypt and to avoid the AutoProxy I made this
Click Run, and type regedit to open the Registry Editor. Find and open HKEY_CURRENT_USER\Software\Psiphon3, and on the right side you will see SkipProxySettings. Set this value to 1 and Psiphon will not automatically configure the system proxy settings.
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