By default Client Authentication allows you to authenticate using HTTP (on port 900) or Telnet (on port 259). Both of which can pose security risks due to the username and passwords being sent un-encrypted.
To secure Client Authenitcation follow the following steps :
Change the following line in $FWDIR/conf/fwauthd.conf,
900 fwssd in.ahclientd wait 900
900 fwssd in.ahclientd wait 900 ssl:defaultCert
And remove the line :
259 fwssd in.aclientd wait 259
This allows you to change the HTTP server to an encrypted HTTPS server and disables authentication over Telnet.
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