openvpn3 can not able to establish connection though openvpn can.

[KES777]

2025-02-10 19:19:04  [STATUS] Connection, Client connected
2025-02-10 19:19:04  Client -- ERROR --: Compression Error: server pushed compression settings that are not allowed and will result in a non-working connection. 

Also this is not clear from output which settings are not allowed. The output should be more verbose with --log-level 6

[dsommers]

Regarding log levels

To get more detailed logs, ensure that the log service allows it:

  # openvpn3-admin log-service --log-level 6

Then you need to have verb 6 in the configuration profile or import the configuration profile (openvpn3 config-import) and set the log level with:

 $ openvpn3 config-manage --show --config CONFIG_NAME --log-level 6

Regarding compression

From the error it is the server pushing either the comp-lzo or compress option. By default, OpenVPN 3 does not allow compression (details).

• If you control the server: Modify the server configuration to use compress migrate instead of existing comp-lzo or compress option. Also double check that there are no push statements with the same options.

• If you only control the client side, allow asymmetric encryption. This will allow the client to receive compressed data but will never send compressed data back to the server. This is done by importing the configuration profile (openvpn3 config-import) first and then set the allow-compression:

    $ openvpn3 config-manage --show --config CONFIG_NAME --allow-compression asym
  

Documentation pointers

• man page - openvpn3-admin log-service: https://codeberg.org/OpenVPN/openvpn3-linux/src/branch/master/docs/man/openvpn3-admin-log-service.8.rst.in
• man page - openvpn3 config-manage: https://codeberg.org/OpenVPN/openvpn3-linux/src/branch/master/docs/man/openvpn3-config-manage.1.rst