kaka81 0 Posted May 13, 2015 Share Posted May 13, 2015 Hi, I've installed Eset Endpoint Security to our clients and since this installation my clients (~70) lose their DNS for sometime. what does that mean? - nslookup ends in an timeout -> DNS server unknown - ping to ip and domain name work well for a while - clients aren't able to print because \\dc\printer can't be found and is displayed as "offline" - sometimes an "ipconfig /release and renew" works, sometimes not, sometimes disabling and enabling NIC on clients works sometimes not, a reboot of client works sometimes and sometimes not,... - after a while (30mins, 3h, 1.5h, 10mins -> randomly) suddenly it works again. I've following configuration: - DC (Server 2012 R2 -> DNS, DHCP Server, DC, etc.) - DC02 -> Failover Server for DC, but it's not working correctly - via DHCP DNS and WINS 192.168.0.1 (dc) and 192.168.0.15 (dc02) are correctly configured - Eventviewer on server and clients doesn't give a hint what's going wrong Are there any known issues according to this problem or does someone have any idea? Thank you very much. Cheers, Christoph Link to comment Share on other sites More sharing options...
Administrators Marcos 4,919 Posted May 13, 2015 Administrators Share Posted May 13, 2015 Did you install Endpoint v6 or v5? Does disabling the firewall make a difference? If not, what about temporarily disabling Epfw LightWeight filter in the network adapter setup? Link to comment Share on other sites More sharing options...
kaka81 0 Posted May 15, 2015 Author Share Posted May 15, 2015 (edited) I've installed v6. Enabling/disabling the firewall makes no difference. What's Epfw LightWeight filter? Edit: ok, just find the option in network adapter properties. What does this option/feature exactly do? Edited May 15, 2015 by kaka81 Link to comment Share on other sites More sharing options...
Administrators Marcos 4,919 Posted May 15, 2015 Administrators Share Posted May 15, 2015 It will disable network filtering so the firewall will not work. Link to comment Share on other sites More sharing options...
kaka81 0 Posted May 15, 2015 Author Share Posted May 15, 2015 Ok but firewall was/is disabled at all. Shouldn't it be the same? My it partner asked me if I have installed nac server at installation of eset but what I've found on the internet is nac only a plugin for Cisco devices and I haven't any Cisco device. Or does he mean something different? Link to comment Share on other sites More sharing options...
kaka81 0 Posted May 18, 2015 Author Share Posted May 18, 2015 I've got this problem right now on my own PC. nslookup doesn't work, then I've disabled Epfw LigthWeight filter on LAN adapter and IPv6, pressed OK and nslookup was working immediately. So it seems to be a problem with Epfw? If yes, how to fix this problem? Without these option no Eset firewall is working? Link to comment Share on other sites More sharing options...
kaka81 0 Posted May 20, 2015 Author Share Posted May 20, 2015 Again it's me: I've uninstalled Eset on 2 clients and it worked well. So it seems to be a problem with Eset resp. with the efpw lightweight filter which is installed with Eset on NICs. Any suggestions? Link to comment Share on other sites More sharing options...
kaka81 0 Posted May 26, 2015 Author Share Posted May 26, 2015 No one? Link to comment Share on other sites More sharing options...
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