Sophos Connect 2.3 cannot connect to Sophos UTM

I upgraded my Sophos Connect client to the latest version 2.3 ( Sophos Connect 2.3 Update Released) and since then cannot connect via SSL VPN to my UTM / SG230 obviously because of a cipher incompatibility.

Client says Timeout

openvpn.log says:

OPTIONS ERROR: failed to negotiate cipher with server.  Add the server's cipher ('AES-128-CBC') to --data-ciphers (currently 'AES-256-GCM:AES-128-GCM:CHACHA20-POLY1305') if you want to connect to this server.

I even cannot fix this because the UTM doesn't provide any of the ciphers listed behind "currently" as a cipher setting. I tried AES-256-CBC but this didn't help and instead created issues with all other users not being able to reconnect suddenly.

Any ideas?

Best regards,

Oliver Regelmann