VPN Client Ubuntu

Hi

I am trying to connect to a Sophos Fw via OpenVpn in a Ubuntu 22.04 LTS installation

I downloaded the vpn configuration from the web site--> ok

Tried to add in network manager GUI but no way to add it until the line 

;route remote_host 255.255.255.255 net_gateway 

has been commented out

Trying to connect via terminal:

with configuration file downloaded from the site

>VERIFY ERROR: depth=0, error=CA signature digest algorithm too weak: C=IT, ST=NA, L=NA, O=zzzzzzzzz, OU=OU, CN=SophosApplianceCertificate_C4xxxxxxxxxxxxxxxx, emailAddress=xxxxxxx, serial=87zzzz8

making the same changes as before (;route remote_host...) the vpn work smoothly but the dns name (regarding the remote site) are not resolved

So

- It is not possible to load the configuration from file without modifying it

- via terminal works but no remote dns resolution (local ok)

I've found this solution:

https://askubuntu.com/questions/1407774/cant-connect-to-vpn-after-upgrading-to-ubuntu-22-04

but I cannot find the field "TLS ciher string" in the netowrk mngmt GUI

1. Write DEFAULT:@SECLEVEL=0 in the "TLS cipher string" field

Any suggestion? Were you able to connect to sophos firewall with a ubuntu openvpn client?

Thanks