By default, the Host IPS NDIS drivers block network traffic for unsupported protocols. Protocols listed when configuring a firewall rule are the supported protocols. 

When the Allow traffic for unsupported protocols option is enabled through the Host IPS Firewall Options policy in the ePO console, you configure the NDIS drivers to pass unsupported protocol traffic instead of blocking it. It might resolve third-party application issues even if the Host IPS Firewall feature is disabled.

To troubleshoot the Host Intrusion Prevention 8.0 NDIS drivers, see KB75917.