Ssl – The SSL certificate doesn’t established

In order to download the certificate, you need to use the client built into openssl like so:

echo -n | openssl s_client -connect $HOST:$PORTNUMBER -servername $SERVERNAME \
    | openssl x509 > /tmp/$SERVERNAME.cert

That will save the certificate to /tmp/$SERVERNAME.cert.

The -servername is used to select the correct certificate when multiple are presented, in the case of SNI.

You can use -showcerts if you want to download all the certificates in the chain. But if you just want to download the server certificate, there is no need to specify -showcerts. The x509 at the end will strip out the intermediate certs, you will need to use sed -n '/-----BEGIN/,/-----END/p' instead of the x509 at the end.

echo -n gives a response to the server, so that the connection is released

openssl x509 removes information about the certificate chain and connection details. This is the preferred format to import the certificate into other keystores.

OK, well, it turns out, "renewing" was not what I wanted, although you would think it was. Looking at https://www.geocerts.com/csr/iis_renew_7 told me that I just wanted to issue a new request, not do a renewal.

I tried moving the cert to Personal, which let me issue a renewal request, but the CA (Network Solutions in this case) didn't like that request. They were fine with the new request though. So it all worked out from that in the end.