Ssl – How to resolve the error “SSL received a record that exceeded the maximum permissible length” in apache2

Great! So just to be clear, you were at the point where the error was SSL_ERROR_HANDSHAKE_FAILURE_ALERT. One nice way to investigate is with

openssl s_client -state -debug -showcerts -verify 0 -connect example.com:443

(and all sorts of useful options) and you were helpful enough to have provided the actual server name.

Handshake error is caused by, well, an error during the SSL / TLS handshake. We got the certificate just fine, which led me to assume that the problem was either something failing in response to CertificateRequest from the server, or something funky with the cipher suite. The latter problem has its own set of error messages now that I think about it more. Firefox's NSS and SSL Error Codes is handy here.

SSLVerifyClient require in the Apache configuration will indeed require that the client present a valid certificate to authenticate to the server, which was the problem as you confirm.

the port-share option sets the port the other application is listening.

What you want to do, is to configure

port-share 10443

and set Apache to listen on port 10443:

Listen <your-public-ip>:10443

That's because two applications can't open same port at once.