I was wondering when I connect to an OpenVPN server what kind of information can the server extract from my client?

Obviously the server can detect my user-id, pwd, but can it detect:

  • My vpn-client-software (say would it know that I'm connecting using tunnelblick)?
  • My O/S (osx, linux, windows, etc)
  • My IP (I think the answer to this one is YES)
  • My mac-address (aa:bb:cc:...)

Not sure how the question @Ohnana has linked answer my question?

I'm not talking about a vpn server tracking my traffic, I'm asking if they can extract information about my machine and my client?

  • Possible duplicate of Can OpenVPN monitor my passwords in my browser?
    – Ohnana
    Feb 11, 2016 at 19:23
  • @Ohnana I don't know enough about vpn to see a relation between what they're asking and what I'm asking...
    – hba
    Feb 11, 2016 at 19:26
  • 3
    The second bullet point of the answer stood out as the answer to your question: "If someone runs the OpenVPN server for you then it is a matter of trust..." Since they own the server, they can install extra utilities to fingerprint your machine, capture software banners, and log your IP address.
    – Ohnana
    Feb 11, 2016 at 19:36
  • True. The server indeed can fingerprint and intercept a lot in theory like Ohnana said. However, using an operating system like e.g Tails solves a lot of these fingerprint issues (tails.boum.org/contribute/design) you can configure any (UNIX/*nix) system to avoid fingerprinting. Yet using Tails is safer against human errors.
    – O'Niel
    Feb 11, 2016 at 19:55

1 Answer 1


Agree with @Ohnana and I have some to add: it is possible via source tailoring to make an OpenVPN client "faceless", without any os/version/libs fingerprint. But if this openvpn is not used as a tunnel for another OpenVPN - first web browser HTTP plain session will tell everything about you

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.