The issue is caused by the improperly working DPI data channel despite its correct configuration.

To resolve the issue:

1. Login to the DSM console.
2. Go to Computers > Domain Controller.
3. Click Intrusion Prevention Rules and click Assign/Unassign.
4. Unassign the following IPS Rules:
   • 1005067 - Identified potentially harmful client traffic
   • 1005090 - Identified potentially harmful server traffic
5. Save the changes.
6. Login to Deep Security Virtual Appliance (DSVA) and run the following command to re-establish the IPS data channel:

   $>sudo stop ds_filter
   $>sudo rmmod vmxnet3
   $>sudo modprobe vmxnet3
   $>sudo /etc/init.d/ds_datachannel start
   $>sudo start ds_filter
   Then
   $>cd /dev
   $>ls

   You should see the vmxnet_eth2_shm character device.

7. Restart the DSVA.