Hello,
Please Try this:
Step 1) Check the Security Logs under Client Management for Denial of Service Detections for the IP address to confirm the issue.
To resolve the issue you will need to disable Denial of Service detection within your Instrusion Prevention policy or you will need to add the IP address in "Excluded Hosts."
To add the printer to "Excluded Hosts":
1. Open your Intrusion Prevention Policy.
2. Choose to Settings on the left.
3. Check the box for Enable excluded hosts and then click the Excluded Hosts... button.
4. Add the IP address of your printer and choose Okay.
OR
Also, try the following:
STEP 2) To create an exception for Intrusion Prevention Policy to allow a specific ID:
1. Open Symantec Endpoint Protection Manager console .
2. Select 'Policies' tab.
3. Under 'View Policies', select 'Intrusion Prevention'.
4. Select Intrusion Prevention policy, and under 'Tasks' select 'Edit the Policy'.
5. Select 'Exceptions' tab.
6. Click on 'Add...' button.
7. Search and select ID blocked.
8. Click on 'Next>>' button.
9. Change 'Action', from 'Block' to 'Allow'. Click on 'OK' button.
10. Check if the exception edited has been added to 'Intrusion Prevention Exceptions' list.
11. Click on 'OK' button for save changes in the Intrusion Prevention policy.
OR
STEP 3 ) Disable DoS detection:
- Log-in to the Symantec Endpoint Protection Manager (SEPM)
- Click Policies then click Intrusion Prevention
- Edit the intrusion prevention policy that applies to the client in question
- Click Settings
- Remove the check-mark next to Enable denial of service detection
Once the policy is applied to the client the DoS detections (and associated Active Response if configured) should no longer occur.
Please note, this will completely disable DoS detection on the client. There is not currently a way to add an exclusion for DoS detection.
OR
STEP 4) Enabling Smart traffic filtering
http://www.symantec.com/docs/HOWTO27095
OR
STEP 5) TRY uninstalling the Network Threat Protection and Application and Device Control by:
Going to Control Panel> from Add/Remove Programs > Highlight Symantec Endpoint Protection and Click on Modify.
Disable the Network Threat Protection and Application and Device Control
I am sure the first step would help you . However the other steps are just for incase.
Hope that might help you.