net_gateway not working with Sequoia and client 3.5.x

[Alvils]

Hi there!

I have a setup that, generally, pushes all traffic through the VPN tunnel, yet in order to conserve the server resources, pushes some net_gateway routes to the client that allow to "bypass" the VPN tunnel for specific traffic. The server is the open source OpenVPN, version 2.6.12 in this case.

In the particular case, client configuration file has a line

redirect-gateway def1

And the server configuration file has lines

# Exclusion routes for Google Meet
push "route 74.125.250.0 255.255.255.0 net_gateway"
push "route 142.250.82.0 255.255.255.0 net_gateway"

This allows all the traffic to pass through the VPN, sans Google Meet video calls.

This works fine on e.g. Windows version of the client, with the latest OpenVPN Connect client, 3.5.1.

On macOS Sequoia (15.0.1 and also 15.1.1), with client version 3.5.1, this error shows up:



In the client logs, there are lines:

POST unix://[/var/run/agent_ovpnconnect.sock]/tun-setup : 400 Bad Request
route_gateway_error: GDG: problem writing to routing socket: -1 errno: 3 msg: No such process

Downgrading the client to version 3.4.9 fixes the issue for now.

So, in order to reproduce:

• server has to push routes with net_gateway
• macOS Sequoia
• OpenVPN Connect 3.5.1 won't work
• OpenVPN Connect 3.4.9 will work fine

Is this something that can be fixed by tinkering with macOS itself or is this an actual issue with OpenVPN Connect?

[JosephS]

Hello Alvils,

This is a known issue with Connect App version 3.5.1 on macOS.
The fix for this issue will be released in the upcoming 3.6.0 Connect App.

With Regards,
JosephS