How to hardcode or customize the logon page to proceed for RADIUS auth without entering password in SSL/IPsec VPN client ?

ok, question i have is what happen if your radius server received a auth request with username and password setup ? does he initiate the otp process or does he try to validate the password ? if it doesn't care about the password you should put in the variable assign a fake password, instead of using a custom expression use a text option to configure anything. Or does you radius expect a generic password you are trying to set ?