I have a strange problem with SLL.

I purchased a SSL cert and combined the intermediary files into one:
cat www_mydomain_com.crt PositiveSSLCA2.crt AddTrustExternalCARoot.crt >> mydomain-budle.crt

In the server conf I have the following:

server
{
listen 80;
listen 443 ssl;

server_name www.mydomain.com;
root /var/www/mydomain/;

ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers AES128-SHA:AES256-SHA:RC4-SHA:DES-CBC3-SHA:RC4-MD5;
ssl_certificate /etc/nginx/conf/mydomain-bundle.crt;
ssl_certificate_key /etc/nginx/conf/server.key;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;
ssl_verify_depth 2;
...
}

SSL doesn't work and error log shows
no "ssl_certificate" is defined in server listening on SSL port while SSL handshaking, client: x.x.x.x, server: 0.0.0.0:443

What's wrong? Of course, the file exists, I restarted the server. I tried everything I could think of (absolute path, I added ssl_verify_depth, verified that in the crt file the END/BEGIN blocks are on separate lines)