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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