You may also try the below mention steps..
1}
- From the main menu along the left side in the SEPM, choose Policies.
- Under View Policies, click on Firewall.
- Double click on the policy you wish to edit. A new window will open.
- On the left side, click on Rules.
- At the bottom, click on Add Blank Rule.
- Name the rule Allow SMB Network Browsing.
-Under Application, right-click on Any, then choose Edit....
- Next to file name, manually type in C:\Windows\System32\ntoskrnl.exe (or browse to it using the Browse button).
- Ensure Action is set to Allow.
- Use the Move Up or Move Down button to place the rule above any other that would otherwise block this application. It is recommended to place this rule in the Administrative area, above the blue line
2}
1.Login into your Symantec Endpoint Protection Manager.
2.Click on Policies - Intrusion Prevention - edit your Intrusion Prevention policy
3.Click on Settings
4.Tick the "Enable excluded hosts" option and click on the Excluded Hosts button to add your ip address (or a range of ip address, alternatively you could also use the subnet option).