ACl Not Blocking VLAN Access

Hi

I was wondering if somebody could help me with an ACL configuration issue.

We have recently implemented a separate VLAN (VLAN30) for our guest Wi-Fi.  The wireless access point is connected to port number 22 on a GS728TPP Smart Switch.  The smart switch is then connected to an M4100-12GF (Backbone2).  This then runs across the building to another M4100-12GF (Backbone1), which then connects to our firewall.

DHCP for VLAN30 is controlled by the second M4100-12GF (Backbone1). VLAN1 is on x.x.0.0 and VLAN30 is on x.x.30.0.  Default route is x.x.0.6.  I can connect to the wireless access point without issue, get the relavant DHCP details and surf the internet without any problems.

The issue I have is when I try to block access the rest of the x.x.0.0 subnet.  I have setup the ACL on the GS728TPP as follows, and then bound it to Port 22:

From everything I have read on various Netgear threads over the last 2 days this should be ok.  However if I connect using a laptop I still can access or at the very least see (ping) devices on the x.x.0.0 subnet.

Any help you can give would be appreciated.

Cheers

Jim