OpenVPN 2.7.1 dropped on March 31, 2026, as the first maintenance update to the 2.7 series. Not a dramatic release, but there are a few things worth paying attention to — especially if you run servers or deal with authentication on the edge.
The most interesting new addition:
a `username-only` flag argument for the `–auth-user-pass` parameter, making OpenVPN query only for a username and send a dummy password to the server. A niche feature, admittedly — it’s only useful when authentication schemes on the server side do an external challenge based on usernames, not password auth. If your setup doesn’t use something like that, you won’t care. But if it does, you’ve probably been hacking around this for a while.
Performance fix that should’ve shipped earlier:
the default sizing of internal hash maps has been bumped to 4 × `–max-clients`. The old default was 256, even when `--max-clients` was set to 1024 — which was hurting performance while saving almost no memory. That’s the kind of bug that quietly degrades servers for months before anyone traces it back to a default. If you’re on constrained hardware, the devs suggest lowering `–max-clients` manually.
Smaller but real improvements:
- The systemd unit files now use `Tasks Max` instead of `Limit NPROC`, with an increased limit.
- Incoming connections are now logged at verbosity level 3 instead of the error level. Cleaner logs, fewer false alarms.
- A warning now prints at runtime when using `–tls-cert-profile` compiled against the AWS-LC SSL library.
- Private-key passphrases longer than 64 characters no longer get silently broken. That one’s a quiet fix with real security implications — good to see it addressed.
Bug fixes worth noting
The `–lport` option inside a `<connection>` block was broken when used with the multi-socket patch set — that’s fixed. An obscure ASSERT() crash triggered by TCP connects with TAP and no IP configuration is also gone.
On the platform side, DCO now works on big-endian Linux systems (MIPS and PowerPC) and on FreeBSD kernels without IPv4 support. The `–enable-async-push` flag works correctly on FreeBSD 15.
Overall, 2.7.1 is exactly what a first maintenance release should be — no surprises, just targeted fixes and a couple of sensible improvements. The passphrase fix and the hash map sizing correction are probably the most practically impactful for anyone running production OpenVPN servers. Source tarball and build instructions are on the project’s GitHub page.
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