Hi,

i've got a VPN connection problem via Nework-Mangager tried with KUbuntu 19.10 and 20.04.
OpenVPN-Configuration in Server-Side:
- LZO compression not set
- "compress" set

i can't configure my client to get a working connection.
"journalctl -u NetworkManager -f " is giving me these errors for this LZO-Settings:
- Unchecked:
nm-openvpn[22436]: write to TUN/TAP : Invalid argument (code=22)
- Adaptive:
nm-openvpn[21629]: Bad compression stub decompression header byte: 251
- No:
nm-openvpn[22826]: Bad compression stub decompression header byte: 251
- Yes:
nm-openvpn[23228]: Bad LZO decompression header byte: 251

I had a go with the openVPN cli client, with seems to have the exact same problem as soon as i remove the "compress" option from the ovpn-file.

It seems i have to set this option within NetworkManager, but I can't find it anywhere.
Is there any way? Maybe setting it manualle in the /etc/.../...nmconnection File?

Thank you,
eini

Got my answer from the NetworkManager maintainer.
This is the Solution:

nmcli connection modify "$VPN_PROFILE" -vpn.data 'comp-lzo' +vpn.data 'compress=yes'

But the OpenVPN part of the NetworkManager-GUI needs definitely some makeover.
"comp-lzo" ist present, but depricated in OpenVPN, "compress" is a valid option, but missing.
See https://community.openvpn.net/openvpn/w ... n24ManPage.

eini