38Encryption settingsThe AdderView CATx IP offers a great deal of flexibility in its configurationand this extends equally to its encryption settings that are used to preventunauthorised interception of signals. Due to the variety of situations in whichthe AdderView CATx IP might be used and the range of viewer applications thatneed to view it, a number of settings are available. The encryption settings touse depend upon how the potential global users will operate.Important factors to consider when setting these options might be:• Do all global user connections and operations require encryption?• Will some global users be using older VNC viewer versions?AdderView CATx IP encryption settingsThe AdderView CATx IP configuration menu offers three encryption settings:• Always on - This setting will force all viewers to use encryption. Note:This setting will preclude any VNC viewer versions that do not supportencryption.• Prefer off - This setting does not enforce encryption unless a viewerspecifically requests it. If a viewer has its ‘Let server choose’ setting, then anun-encrypted link will be set up.• Prefer on - This setting generally enforces encryption unless an earlierviewer version is unable to support it, in which case the link will be un-encrypted. If a viewer has its ‘Let server choose’ setting, then the link will beencrypted.Viewer encryption settingsThe web browser viewers and VNC viewers (of level 4.0b5S or higher) offer fourencryption settings:• Always on - This setting will ensure that the link is encrypted, regardless ofthe AdderView CATx IP encryption setting.• Let server choose - This setting will follow the configuration of theAdderView CATx IP. If the AdderView CATx IP has ‘Always on’ or ‘Prefer on’set, then the link will be encrypted. If the ‘Prefer off’ setting is selected atthe AdderView CATx IP, then the link will not be encrypted.• Prefer off - This setting will configure an un-encrypted link if theAdderView CATx IP will allow it, otherwise it will be encrypted.• Prefer on - If the AdderView CATx IP allows it, this setting will configure anencrypted link, otherwise it will be un-encrypted.
