Thank you for your time to clarify it is an issue with openssl-3 that makes sha1 obsolete/invalid/whatever. I was interested in what you suggested "You may want to re-create them and use the default SHA256 for signing." You mean, there is a way to convert the current "/path/to/certificate/file.p12", that was given to me by the company that I work for, in another file which is openssl-3 compatible file to use with nm-openvpn ? If so, please, can you help me on this ? I have zero knowledge on certificates, I just use them...