bozohttpd letsencrypt not working with firefox/chrome

[Mayuresh <mayuresh%acm.org@localhost>]

I am trying to httpsize a NetBSD 8.1 based website.

Got the certificate from letsencrypt using security/py-certbot

I have started httpd with  -Z <cert> <key> option.

When accessing this site firefox says:

An error occurred during a connection to flowervalleywanawadi.in. Cannot
communicate securely with peer: no common encryption algorithm(s). Error
code: SSL_ERROR_NO_CYPHER_OVERLAP 

Tried chrome on android, it says:

server sent an invalid response
ERR_INVALID_REDIRECT

On the other hand, a stock browser on mobile phone is able to connect with
the site with no error!

What could the way out?

Mayuresh