How to save a remote server SSL certificate locally as a file

I need to download an SSL certificate of a remote server (not HTTPS, but the SSL handshake should be the same as Google Chrome / IE / wget and curl all give certificate check fail errors) and add the certificate as trusted in my laptops Windows' certificate store since I am not able to get my IT guys to give me the CA cert. this is for office communications so I cannot really use the actual client

[labocho]

cli で ssl 証明書をダウンロード openssl 使う