Hi,
Check this setting in SEPM firewall
Block Wireless traffic using a Firewall rule
- Select Clients> Policies in the Symantec Endpoint Protection Manager console.
- Under "View Policies", select Firewall.
- Double click the Firewall Policy for the "Ethernet" location.
- Select Rules on the left
- Click the "Add a new Blank Rule." button on the lower right side of the window.
- Select the Blank Rule made in the previous step and move it to the top of the rule list.
- Double click Action and select Allow.
- Double click Adapter and select Wireless.
- Leave "Application", "Host", "Service" and "Time" as Any.
- Click OK. The action is now completed.
Check this artical
http://www.symantec.com/business/support/index?page=content&id=TECH104970