Block the Serial API on these sites

Setting the policy lets you list the URL patterns that specify which sites can't ask users to grant them access to a serial port.

Leaving the policy unset means DefaultSerialGuardSetting applies for all sites, if it's set. If not, the user's personal setting applies.

For URL patterns which do not match the policy SerialAskForUrls (if there is a match), DefaultSerialGuardSetting (if set), or the users' personal settings take precedence, in that order.

URL patterns can't conflict with SerialAskForUrls. Neither policy takes precedence if a URL matches with both.

For detailed information on valid url patterns, please see * is not an accepted value for this policy.

Example value:

Supported on: At least Microsoft Windows 7 or Windows Server 2008 family

Block the Serial API on these sites

Registry PathSoftware\Policies\Google\Chrome\SerialBlockedForUrls
Value Name{number}
Value TypeREG_SZ
Default Value


Administrative Templates (Computers)

Administrative Templates (Users)