As far as i know, all GP config are done on the firewall side. May someone else correct me if i am wrong but i don't think there is much you can change via the CMD. The GP portal addr and Username&Pwd are done only on the firewall side
Not sure why you would want to do this but its not possible.
it is possible to use a native vpn client and connect directly to the gateways but not GP
some native/legacy vpn clients do allow command line execution, including auth details.
im sure the open source "openconnect" allows this but never tried it.
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