Single WAN OpenVPN issue can connect, intermittent access to network (2.5.1)

[iampowerslave]

Hi there.

I have read other threads regarding the new version and OpenVPN issues but I haven't found one that covers an issue similar as the one I'm having, which is quite recent, after years of running the same config in pfSense, which is actually running 2.5.1

This is what happens. Windows 10 clients (that have not been recently updated) using the 2.4.x client or the 2.5.2 client, they can connect to OpenVPN without issues. They used to have full access to any service on the other side with no problems. A few days ago, they started to fail to connect to some hosts or some services, until they could not ping any machine or access the Webconfigurator or ping the gateway.

At that point I've checked everything on the Windows side, and nothing helped.

Strange thing is, that when I'm completely out of the network, my Android phone can still run any ping or service over OpenVPN and is the only one that can connect to the server. I restart the server and the Windows clients can now get into the network again.

I'm not a guru but seems another side effect of the 2.5.1 update. Is there something I can do to fix or workaround this?

Thanks!