Troubleshooting

VERIFY ERROR: depth=0, error=CA signature digest algorithm too weak

Soluce :

in /etc/NetworkManager/system-connections/vpn.nmconnection add 

tls-cipher=DEFAULT:@SECLEVEL=0

then 

sudo systemctl restart NetworkManager
same error on android with openvpn

under “server list” → Custom options 

tls-cipher "DEFAULT:@SECLEVEL=0"