I am using the apn module (https://github.com/argon/node-apn) to send push notifications to iPhones from NodeJS.

My code works fine on my development machine (Mac OSX) and is successfully pushing notifications through the Apple sandbox gateway (gateway.sandbox.push.apple.com), but when I move it to the staging server (which is running Ubuntu) pushing notifications fails with the message:

```
 Error: ENOENT, no such file or directory 'apns-dev-cert.pem'

```

I am setting up the NodeJS apn object as such:

```
var options = {
    cert: "apns-dev-cert.pem",          
    key:  "apns-key.pem",               
    passphrase: null,   
    gateway: "gateway.sandbox.push.apple.com",              
    port: 2195,                         
    enhanced: true,                     
    errorCallback: undefined,                       
    cacheLength: 5                                  
};

```

On my development Mac OSX machine, the cert is installed in the Keychain. From my limited understanding of Ubuntu, the equivalent would be to copy the cert file to /etc/ssl/certs. I tried doing this, and also changing the path to "/etc/ssl/certs/apn-dev-cert.pem" in my NodeJS code, but the same error message shows up.

Any ideas?