I did a search on this topic and found this thread from 2009. Wasn't very helpful I'm in a similar boat. I recently upgraded my PC and had specifically bought hardware that would allow me to set up an LACP trunk to my switch (specs listed below). I'm hoping my slightly different scenario might enable ESET to rectify the problem. I had ESS 18.104.22.168 running nicely using only a single NIC, but couldn't get it to connect to the switch with an LACP trunk configured - "Network cable unplugged". I had tried numerous drivers and a couple of different version of the "Realtek Ethernet Diagnostic Tool" (used to configure teaming), but all had the same result. I removed the "Eset Personal Firewall" service from the two physical NIC's (It wasn't present in the Local Area Connection titled "Realtek Virtual Miniport Driver for Teaming"). Immediately it detected a connection but was unable to establish DHCP parameters or even static addressing, essentially locking it as an "Unidentified connection". I'd tried relaxing Windows' networking options and managed to manually configure it as a "Work" (private) network, but it still remained as an "Unidentified connection". I tried disabling ESS firewall, with no effect. Then I disabled "real-time file system protection" and voila! It worked! I knew the firewall wasn't completely functional since I'd removed the "Eset Personal Firewall" service from the two physical LAN connections, and also 'cos it didn't exist on the virtual connection either. I thought at that point perhaps uninstalling and reinstalling ESET would mean that it might properly install on the virtual connection. Part the way through the installation I was greeted with a STOP 0xD1 BSoD on RtTeam60.sys. After rebooting, ESET was reporting that it couldn't access the firewall configuration data (or to that effect) and the real-time protection along with the other key features (antivirus, firewall, anti spam, etc) were all not working. I should also add that after all this, I tried configuring LACP without ESET SS being installed and it worked flawlessly. All this seems to point at an issue with ESET SS... I absolutely LOVE ESET SS and it would greatly pain me to have to switch to something else to get around this issue. I'd be willing to pay for a business or server version if I knew it would work with Realtek's teaming drivers. Specs: Core i7-2600 Gigabyte P67A-UD7 (Realtek 8111E NIC's) 8GB Corsair XMS 1600MHz DDR3 RAM (passed Memtest86+) Windows 7 Ultimate 64-bit SP1 ESET Smart Security 22.214.171.124 Connecting to an HP ProCurve 1810G-8 switch. Any other details required, just let me know. I will also email this message to ESET Support. Thanks!