Question about ssl CRL

Server NGINX
1

Hi

New to nginx, trying to setup a SSL reverse proxy. I have the SSL server
and client setup working, but when I add in crl pem it fails

I downloaded the CRL from verisign converted from DER to PEM format and
saved.

When I uncomment
#ssl_crl /var/www/dev.xyz.com/certs/crl.pem;
My clients fail to connect, I get an 400 error !

Not sure what the issue is ?

Thanks
Alex

{code}

server {
listen 447 ssl;
server_name dev.xyz.com;

    ssl                 on;
    ssl_protocols       SSLv3 TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers

AES128-SHA:AES256-SHA:RC4-SHA:DES-CBC3-SHA:RC4-MD5;
ssl_certificate /var/www/dev.xyz.com/certs/dev.xyz.com.crt;
ssl_certificate_key /var/www/dev.xyz.com/certs/dev.xyz.com.key;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;

    # 1.3.7
    #ssl_client_certificate

/var/www/dev.xyz.com/certs/dev.xyz.com.AcceptableUserCertsCA;
#ssl_trusted_certificate
/var/www/dev.xyz.com/certs/dev.xyz.com.UserCertsCA;

    ssl_client_certificate

/var/www/dev.xyz.com/certs/dev.xyz.com.UserCertsCA;
#ssl_crl /var/www/dev.xyz.com/certs/crl.pem;

    ssl_verify_client on;
    ssl_verify_depth 3;

access_log  /var/log/nginx/dev.xyz.com.access.log  main;
error_log  /var/log/nginx/dev.xyz.com.error.log warn;

location / {
    root   /var/www/dev.xyz.com/wwwroot/;
    index  index.html index.htm;
    autoindex on;
}