Rails - Dec 2013 - Cannot run second rails app in second domain (in vps)

Hi for everyone.
I have a problem with my vps and my app in rails.
A few months I constructed an app with rails, in my vps, the application is 
working fine, without any problem, i working with a version 4.0 and the 
version for ruby is 1.9.3.
In a second domain, i installed the same version for both (ruby and rails), 
and run the application without any problem, in port 3000(the first is in 
3005) but when i try to load in my browser, nothing happened ( run the app 
in this way : www.mydomain.com:3000 ), no load,no showing error in my ssh 
client.¿What's going on?.
I thought that my app was wrong, that's why delete the folder and build a 
new blank rails project, but when i run ( my domain is 
www.mydomain.com/app:3000) nothing happen, not load the website.

¿What can be the problem?

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