I found myself with the same problem and found the cause (and obvious solution).

On my nginx server I run various website and they all have their own server {} config block in separate files under 'sites-available' folder.
Some sites are on different IP's and some are on the same IP.

Now the cause of the problem was because I'd had set 2 server blocks listening on the same IP on SSL for different server_names like so:

server {
listen 37.230.101.215:443 ssl spdy;
server_name www.domain1.com *.domain1.com;

ssl on;
ssl_certificate /etc/ssl/cert.crt;
ssl_certificate_key /etc/ssl/key.key;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;

..etc
}

and for another site the same:

server {
listen 37.230.101.215:443 ssl spdy;
server_name www.domain2.com *.domain2.com;

ssl on;
ssl_certificate /etc/ssl/cert.crt;
ssl_certificate_key /etc/ssl/key.key;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;

..etc
}

When you do this it gives the exact same error as this thread is about.. might be something to check.