Setting up PUREVPN certs: 

https://github.com/haugene/docker-transmission-openvpn/issues/1012

  - add /path/to/custom:/etc/openvpn/custom to my volume mounts
    - Create a copy of the ovpn file you want to use to connect to purevpn in this host path (/path/to/custom)
    - Create an auth.txt file here as well that contains two lines. Line 1 is the username only, line 2 is the password only
  - add /path/to/openvpn.cnf:/etc/ssl/openvssl.cnf to my volume mounts
    - This is the config which is causing the md too weak
    - The openssl.cnf file is attached, but all I changed was the default_md from default to sha256
  - Edit the config of the server you want to connect to. For example, nl2-openvpn-udp-udp.ovpn
    - Add /etc/openvpn/custom/auth.txt to the auth-user-pass line
    - Remove the config groups: <ca>, <cert>, <key>, and <tls-auth>
    - Add the contents of the attached file replacement_details.txt. These are the correct certs and keys.
  - Finally, edit the openvpn provider to use CUSTOM as the provider

Hope this helps someone. @haugene I'd be glad to help with a pull request to change the openssl.cnf