Hello everyone, I have one strange issue and decide to ask here if someone could advise. We have the following situation:
Sophos UTM Window 10 1903 Enterprise - Windows Firewall off Active Directory domain OpenVPN 2.4.8 We've deployed 2.4.8 and suddenly we began to have network issues. We found that they are caused by TrendMicro OfficeScan which activates the firewall and block the traffic because somehow it doesn't detect that the network is internal. In this case we have a traffic from the client to the "servers" but when I try ping or remote desktop connection from the servers, they failed. So far so good, we've opened an escalated issue by TrendMicro and we are waiting for answer but I've decided to make some tests and then things became weird. I installed OpenVPN 2.4.6 - everything works fine I installed OpenVPN 2.4.7 - everything works fine Then I look and found that the version 2.4.8 is installing windows tap drivers 9.24.2. I decided and uninstall only the TAP drivers, download the 9.23.3 drivers from here: https://build.openvpn.net/downloads/releases/ And then everything works perfect as expected. Then I've continued to check and found following. With 9.23.3 the created network adapter is Ethernet2 when with 9.24.2 it is now Local Area Connection. Then with 9.24.2 when I open command prompt and check ipconfig /all I see the adapter as "unknown adapter local area connection" which is kind of strange because adapter in windows shows: Local Area Connection /Tap-windows adapter V9. We could say that TrendMicro caused the problem but when I deactivate TrendMicro NDIS Adapter the problem still exist. So, any help and ideas would be greatly appreciated. Unfortunately my knowledge in driver troubleshooting is very limited. Thanks in advance Best regards,
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