We have several VM instances on Google Cloud (GCP) running Ubuntu Server 20 and 22 LTS. Until then, everyone was connecting to our VPN server using the client version 2.5.9. We recently updated the server to version 2.6.6. So far no problems. Everyone using the client in version 2.5.9 can connect to the server in version 2.6.6. However, specifically for clients on Google Cloud, if their clients are updated to version 2.6.6, they are unable to have network traffic with other clients (ping is ok, but they are inaccessible via the web or ssh) also connected to this VPN server. The curious thing is that local servers (outside the Google Cloud environment) that run the same OS can connect and communicate without problems. In short, the problem is on servers that are on Google Cloud and run client 2.6.6. When returning to 2.5.9 communication is reestablished. As in version 2.6.6 there were changes at the kernel level, there may be some incompatibility.
Ubuntu 22 kernel from a VM on gcp: 6.2.0-1016-gcp
Ubuntu 22 kernel from a local server: 5.15.0-88-generic
Anyone facing the same problem or something similar?
OpenVPN client 2.6 issue on Google Cloud instances
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Re: OpenVPN client 2.6 issue on Google Cloud instances
having the same problem...